PHP编程
一、PHP函数的使用
- foreach
$php = [['name' => '欧阳克','age' => '38岁','gongfu' => 'php基础'],['name' => '灭绝师太','age' => '18岁','gongfu' => 'uniAPP'],['name' => '朱老师','age' => '48岁','gongfu' => 'HTML基础'],['name' => '西门大官人','age' => '28岁','gongfu' => '实战']];//第一种方法，此方法只用一个foreach就可以二级数组一个个获取（只要不遍历）foreach数量=几级数组-1foreach($php as $key=> $value){echo $value['name'];echo '<br>';echo $value['age'];}//方法二 历遍二级数组所有这种是几级数组就需要使用几个foreachforeach($php as $key=> $value){foreach($php as $key1=> $value1){echo $value1；}}
$arr = [['area_id' => 110000,'area_pid' => 0,'area_name' => '北京','lng' => 116.405,'lat' => 39.905,'son' => [['area_id' => 110100,'area_pid' => 110000,'area_name' => '北京市','lng' => 116.405,'lat' => 39.905,'son' => [['area_id' => 110101,'area_pid' => 110100,'area_name' => '东城区','lng' => 116.41,'lat' => 39.9316],['area_id' => 110102,'area_pid' => 110100,'area_name' => '西城区','lng' => 116.36,'lat' => 39.9305],['area_id' => 110105,'area_pid' => 110100,'area_name' => '朝阳区','lng' => 116.485,'lat' => 39.9484],['area_id' => 110106,'area_pid' => 110100,'area_name' => '丰台区','lng' => 116.286,'lat' => 39.8585],['area_id' => 110107,'area_pid' => 110100,'area_name' => '石景山区','lng' => 116.223,'lat' => 39.9056],['area_id' => 110108,'area_pid' => 110100,'area_name' => '海淀区','lng' => 116.298,'lat' => 39.9593],['area_id' => 110109,'area_pid' => 110100,'area_name' => '门头沟区','lng' => 116.101,'lat' => 39.9404],['area_id' => 110111,'area_pid' => 110100,'area_name' => '房山区','lng' => 116.143,'lat' => 39.7479],['area_id' => 110112,'area_pid' => 110100,'area_name' => '通州区','lng' => 116.657,'lat' => 39.9097],['area_id' => 110113,'area_pid' => 110100,'area_name' => '顺义区','lng' => 116.654,'lat' => 40.1302],['area_id' => 110114,'area_pid' => 110100,'area_name' => '昌平区','lng' => 116.231,'lat' => 40.2207],['area_id' => 110115,'area_pid' => 110100,'area_name' => '大兴区','lng' => 116.341,'lat' => 39.7267],['area_id' => 110116,'area_pid' => 110100,'area_name' => '怀柔区','lng' => 116.632,'lat' => 40.316],['area_id' => 110117,'area_pid' => 110100,'area_name' => '平谷区','lng' => 117.121,'lat' => 40.1406],['area_id' => 110228,'area_pid' => 110100,'area_name' => '密云县','lng' => 116.843,'lat' => 40.3762],['area_id' => 110229,'area_pid' => 110100,'area_name' => '延庆县','lng' => 115.975,'lat' => 40.4567]]]]],['area_id' => 120000,'area_pid' => 0,'area_name' => '天津','lng' => 117.19,'lat' => 39.1256,'son' => [['area_id' => 120100,'area_pid' => 120000,'area_name' => '天津市','lng' => 117.19,'lat' => 39.1256,'son' => [['area_id' => 120101,'area_pid' => 120100,'area_name' => '和平区','lng' => 117.215,'lat' => 39.1172],['area_id' => 120102,'area_pid' => 120100,'area_name' => '河东区','lng' => 117.226,'lat' => 39.1232],['area_id' => 120103,'area_pid' => 120100,'area_name' => '河西区','lng' => 117.223,'lat' => 39.1096],['area_id' => 120104,'area_pid' => 120100,'area_name' => '南开区','lng' => 117.151,'lat' => 39.1382],['area_id' => 120105,'area_pid' => 120100,'area_name' => '河北区','lng' => 117.197,'lat' => 39.1482],['area_id' => 120106,'area_pid' => 120100,'area_name' => '红桥区','lng' => 117.151,'lat' => 39.1671],['area_id' => 120110,'area_pid' => 120100,'area_name' => '东丽区','lng' => 117.314,'lat' => 39.0863],['area_id' => 120111,'area_pid' => 120100,'area_name' => '西青区','lng' => 117.009,'lat' => 39.1412],['area_id' => 120112,'area_pid' => 120100,'area_name' => '津南区','lng' => 117.385,'lat' => 38.9914],['area_id' => 120113,'area_pid' => 120100,'area_name' => '北辰区','lng' => 117.132,'lat' => 39.2213],['area_id' => 120114,'area_pid' => 120100,'area_name' => '武清区','lng' => 117.044,'lat' => 39.3842],['area_id' => 120115,'area_pid' => 120100,'area_name' => '宝坻区','lng' => 117.31,'lat' => 39.7176],['area_id' => 120116,'area_pid' => 120100,'area_name' => '滨海新区','lng' => 117.702,'lat' => 39.0267],['area_id' => 120221,'area_pid' => 120100,'area_name' => '宁河县','lng' => 117.826,'lat' => 39.3305],['area_id' => 120223,'area_pid' => 120100,'area_name' => '静海县','lng' => 116.974,'lat' => 38.9458],['area_id' => 120225,'area_pid' => 120100,'area_name' => '蓟县','lng' => 117.408,'lat' => 40.0457]]]]],['area_id' => 130000,'area_pid' => 0,'area_name' => '河北省','lng' => 114.502,'lat' => 38.0455,'son' => [['area_id' => 130100,'area_pid' => 130000,'area_name' => '石家庄市','lng' => 114.502,'lat' => 38.0455,'son' => [['area_id' => 130102,'area_pid' => 130100,'area_name' => '长安区','lng' => 114.539,'lat' => 38.0367,],['area_id' => 130104,'area_pid' => 130100,'area_name' => '桥西区','lng' => 114.47,'lat' => 38.0322],['area_id' => 130105,'area_pid' => 130100,'area_name' => '新华区','lng' => 114.463,'lat' => 38.0509],['area_id' => 130107,'area_pid' => 130100,'area_name' => '井陉矿区','lng' => 114.065,'lat' => 38.0671],['area_id' => 130108,'area_pid' => 130100,'area_name' => '裕华区','lng' => 114.531,'lat' => 38.006],['area_id' => 130109,'area_pid' => 130100,'area_name' => '藁城区','lng' => 114.847,'lat' => 38.0216],['area_id' => 130110,'area_pid' => 130100,'area_name' => '鹿泉区','lng' => 114.313,'lat' => 38.0878],['area_id' => 130111,'area_pid' => 130100,'area_name' => '栾城区','lng' => 114.648,'lat' => 37.9002],['area_id' => 130121,'area_pid' => 130100,'area_name' => '井陉县','lng' => 114.143,'lat' => 38.0369],['area_id' => 130123,'area_pid' => 130100,'area_name' => '正定县','lng' => 114.573,'lat' => 38.1445],['area_id' => 130125,'area_pid' => 130100,'area_name' => '行唐县','lng' => 114.553,'lat' => 38.4365],['area_id' => 130126,'area_pid' => 130100,'area_name' => '灵寿县','lng' => 114.383,'lat' => 38.3084],['area_id' => 130127,'area_pid' => 130100,'area_name' => '高邑县','lng' => 114.611,'lat' => 37.6156],['area_id' => 130128,'area_pid' => 130100,'area_name' => '深泽县','lng' => 115.204,'lat' => 38.1835],['area_id' => 130129,'area_pid' => 130100,'area_name' => '赞皇县','lng' => 114.388,'lat' => 37.6614],['area_id' => 130130,'area_pid' => 130100,'area_name' => '无极县','lng' => 114.975,'lat' => 38.1765],['area_id' => 130131,'area_pid' => 130100,'area_name' => '平山县','lng' => 114.186,'lat' => 38.2599],['area_id' => 130132,'area_pid' => 130100,'area_name' => '元氏县','lng' => 114.525,'lat' => 37.7667],['area_id' => 130133,'area_pid' => 130100,'area_name' => '赵县','lng' => 114.776,'lat' => 37.7563],['area_id' => 130181,'area_pid' => 130100,'area_name' => '辛集市','lng' => 115.206,'lat' => 37.9408],['area_id' => 130183,'area_pid' => 130100,'area_name' => '晋州市','lng' => 115.043,'lat' => 38.0313],['area_id' => 130184,'area_pid' => 130100,'area_name' => '新乐市','lng' => 114.69,'lat' => 38.3442]]],['area_id' => 130200,'area_pid' => 130000,'area_name' => '唐山市','lng' => 118.175,'lat' => 39.6351,'son' => [['area_id' => 130284,'area_pid' => 130200,'area_name' => '滦州市','lng' => '','lat' => ''],['area_id' => 130202,'area_pid' => 130200,'area_name' => '路南区','lng' => 118.154,'lat' => 39.625,],['area_id' => 130203,'area_pid' => 130200,'area_name' => '路北区','lng' => 118.201,'lat' => 39.6244],['area_id' => 130204,'area_pid' => 130200,'area_name' => '古冶区','lng' => 118.458,'lat' => 39.7199],['area_id' => 130205,'area_pid' => 130200,'area_name' => '开平区','lng' => 118.262,'lat' => 39.6713],['area_id' => 130207,'area_pid' => 130200,'area_name' => '丰南区','lng' => 118.113,'lat' => 39.5648],['area_id' => 130208,'area_pid' => 130200,'area_name' => '丰润区','lng' => 118.13,'lat' => 39.8244],['area_id' => 130209,'area_pid' => 130200,'area_name' => '曹妃甸区','lng' => 118.46,'lat' => 39.2731],['area_id' => 130223,'area_pid' => 130200,'area_name' => '滦县','lng' => 118.703,'lat' => 39.7406],['area_id' => 130224,'area_pid' => 130200,'area_name' => '滦南县','lng' => 118.674,'lat' => 39.5039],['area_id' => 130225,'area_pid' => 130200,'area_name' => '乐亭县','lng' => 118.912,'lat' => 39.4256],['area_id' => 130227,'area_pid' => 130200,'area_name' => '迁西县','lng' => 118.316,'lat' => 40.1459],['area_id' => 130229,'area_pid' => 130200,'area_name' => '玉田县','lng' => 117.739,'lat' => 39.9005],['area_id' => 130281,'area_pid' => 130200,'area_name' => '遵化市','lng' => 117.964,'lat' => 40.1874],['area_id' => 130283,'area_pid' => 130200,'area_name' => '迁安市','lng' => 118.701,'lat' => 39.9983]]],['area_id' => 130300,'area_pid' => 130000,'area_name' => '秦皇岛市','lng' => 119.587,'lat' => 39.9425,'son' => [['area_id' => 130302,'area_pid' => 130300,'area_name' => '海港区','lng' => 119.61,'lat' => 39.9345],['area_id' => 130303,'area_pid' => 130300,'area_name' => '山海关区','lng' => 119.776,'lat' => 39.9787],['area_id' => 130304,'area_pid' => 130300,'area_name' => '北戴河区','lng' => 119.484,'lat' => 39.8341],['area_id' => 130321,'area_pid' => 130300,'area_name' => '青龙满族自治县','lng' => 118.952,'lat' => 40.4074],['area_id' => 130322,'area_pid' => 130300,'area_name' => '昌黎县','lng' => 119.166,'lat' => 39.7088],['area_id' => 130323,'area_pid' => 130300,'area_name' => '抚宁县','lng' => 119.245,'lat' => 39.8754],['area_id' => 130324,'area_pid' => 130300,'area_name' => '卢龙县','lng' => 118.893,'lat' => 39.8918]]],['area_id' => 130400,'area_pid' => 130000,'area_name' => '邯郸市','lng' => 114.491,'lat' => 36.6123,'son' => [['area_id' => 130402,'area_pid' => 130400,'area_name' => '邯山区','lng' => 114.484,'lat' => 36.6001],['area_id' => 130403,'area_pid' => 130400,'area_name' => '丛台区','lng' => 114.493,'lat' => 36.6185],['area_id' => 130404,'area_pid' => 130400,'area_name' => '复兴区','lng' => 114.459,'lat' => 36.6113],['area_id' => 130406,'area_pid' => 130400,'area_name' => '峰峰矿区','lng' => 114.211,'lat' => 36.4194],['area_id' => 130421,'area_pid' => 130400,'area_name' => '邯郸县','lng' => 114.531,'lat' => 36.5938],['area_id' => 130423,'area_pid' => 130400,'area_name' => '临漳县','lng' => 114.619,'lat' => 36.3346],['area_id' => 130424,'area_pid' => 130400,'area_name' => '成安县','lng' => 114.67,'lat' => 36.4441],['area_id' => 130425,'area_pid' => 130400,'area_name' => '大名县','lng' => 115.154,'lat' => 36.2799],['area_id' => 130426,'area_pid' => 130400,'area_name' => '涉县','lng' => 113.692,'lat' => 36.5807],['area_id' => 130427,'area_pid' => 130400,'area_name' => '磁县','lng' => 114.374,'lat' => 36.3739],['area_id' => 130428,'area_pid' => 130400,'area_name' => '肥乡县','lng' => 114.8,'lat' => 36.5481],['area_id' => 130429,'area_pid' => 130400,'area_name' => '永年县','lng' => 114.489,'lat' => 36.7836],['area_id' => 130430,'area_pid' => 130400,'area_name' => '邱县','lng' => 115.174,'lat' => 36.8208],['area_id' => 130431,'area_pid' => 130400,'area_name' => '鸡泽县','lng' => 114.874,'lat' => 36.9237],['area_id' => 130432,'area_pid' => 130400,'area_name' => '广平县','lng' => 114.947,'lat' => 36.4805],['area_id' => 130433,'area_pid' => 130400,'area_name' => '馆陶县','lng' => 115.299,'lat' => 36.5372],['area_id' => 130434,'area_pid' => 130400,'area_name' => '魏县','lng' => 114.935,'lat' => 36.3617],['area_id' => 130435,'area_pid' => 130400,'area_name' => '曲周县','lng' => 114.952,'lat' => 36.7767],['area_id' => 130481,'area_pid' => 130400,'area_name' => '武安市','lng' => 114.202,'lat' => 36.6928]]],['area_id' => 130500,'area_pid' => 130000,'area_name' => '邢台市','lng' => 114.509,'lat' => 37.0682,'son' => [['area_id' => 130502,'area_pid' => 130500,'area_name' => '桥东区','lng' => 114.507,'lat' => 37.068],['area_id' => 130503,'area_pid' => 130500,'area_name' => '桥西区','lng' => 114.468,'lat' => 37.0598],['area_id' => 130521,'area_pid' => 130500,'area_name' => '邢台县','lng' => 114.566,'lat' => 37.0456],['area_id' => 130522,'area_pid' => 130500,'area_name' => '临城县','lng' => 114.504,'lat' => 37.4398],['area_id' => 130523,'area_pid' => 130500,'area_name' => '内丘县','lng' => 114.512,'lat' => 37.2867],['area_id' => 130524,'area_pid' => 130500,'area_name' => '柏乡县','lng' => 114.693,'lat' => 37.4824],['area_id' => 130525,'area_pid' => 130500,'area_name' => '隆尧县','lng' => 114.776,'lat' => 37.3535],['area_id' => 130526,'area_pid' => 130500,'area_name' => '任县','lng' => 114.684,'lat' => 37.1258],['area_id' => 130527,'area_pid' => 130500,'area_name' => '南和县','lng' => 114.684,'lat' => 37.0049],['area_id' => 130528,'area_pid' => 130500,'area_name' => '宁晋县','lng' => 114.921,'lat' => 37.617],['area_id' => 130529,'area_pid' => 130500,'area_name' => '巨鹿县','lng' => 115.035,'lat' => 37.218],['area_id' => 130530,'area_pid' => 130500,'area_name' => '新河县','lng' => 115.25,'lat' => 37.5272],['area_id' => 130531,'area_pid' => 130500,'area_name' => '广宗县','lng' => 115.143,'lat' => 37.0746],['area_id' => 130532,'area_pid' => 130500,'area_name' => '平乡县','lng' => 115.03,'lat' => 37.0632],['area_id' => 130533,'area_pid' => 130500,'area_name' => '威县','lng' => 115.264,'lat' => 36.9768],['area_id' => 130534,'area_pid' => 130500,'area_name' => '清河县','lng' => 115.665,'lat' => 37.0712],['area_id' => 130535,'area_pid' => 130500,'area_name' => '临西县','lng' => 115.501,'lat' => 36.8708],['area_id' => 130581,'area_pid' => 130500,'area_name' => '南宫市','lng' => 115.391,'lat' => 37.358],['area_id' => 130582,'area_pid' => 130500,'area_name' => '沙河市','lng' => 114.498,'lat' => 36.8577]]],['area_id' => 130600,'area_pid' => 130000,'area_name' => '保定市','lng' => 115.482,'lat' => 38.8677,'son' => [['area_id' => 130602,'area_pid' => 130600,'area_name' => '新市区','lng' => 115.459,'lat' => 38.8775],['area_id' => 130603,'area_pid' => 130600,'area_name' => '北市区','lng' => 115.497,'lat' => 38.8832],['area_id' => 130604,'area_pid' => 130600,'area_name' => '南市区','lng' => 115.529,'lat' => 38.8545],['area_id' => 130621,'area_pid' => 130600,'area_name' => '满城县','lng' => 115.323,'lat' => 38.9497],['area_id' => 130622,'area_pid' => 130600,'area_name' => '清苑县','lng' => 115.493,'lat' => 38.7671],['area_id' => 130623,'area_pid' => 130600,'area_name' => '涞水县','lng' => 115.715,'lat' => 39.394],['area_id' => 130624,'area_pid' => 130600,'area_name' => '阜平县','lng' => 114.197,'lat' => 38.8476],['area_id' => 130625,'area_pid' => 130600,'area_name' => '徐水县','lng' => 115.658,'lat' => 39.021],['area_id' => 130626,'area_pid' => 130600,'area_name' => '定兴县','lng' => 115.808,'lat' => 39.2631],['area_id' => 130627,'area_pid' => 130600,'area_name' => '唐县','lng' => 114.985,'lat' => 38.7451],['area_id' => 130628,'area_pid' => 130600,'area_name' => '高阳县','lng' => 115.779,'lat' => 38.7],['area_id' => 130629,'area_pid' => 130600,'area_name' => '容城县','lng' => 115.872,'lat' => 39.0535],['area_id' => 130630,'area_pid' => 130600,'area_name' => '涞源县','lng' => 114.691,'lat' => 39.3539],['area_id' => 130631,'area_pid' => 130600,'area_name' => '望都县','lng' => 115.157,'lat' => 38.71],['area_id' => 130632,'area_pid' => 130600,'area_name' => '安新县','lng' => 115.936,'lat' => 38.9353],['area_id' => 130633,'area_pid' => 130600,'area_name' => '易县','lng' => 115.498,'lat' => 39.3489],['area_id' => 130634,'area_pid' => 130600,'area_name' => '曲阳县','lng' => 114.701,'lat' => 38.6215],['area_id' => 130635,'area_pid' => 130600,'area_name' => '蠡县','lng' => 115.577,'lat' => 38.4897],['area_id' => 130636,'area_pid' => 130600,'area_name' => '顺平县','lng' => 115.135,'lat' => 38.8385],['area_id' => 130637,'area_pid' => 130600,'area_name' => '博野县','lng' => 115.47,'lat' => 38.4564],['area_id' => 130638,'area_pid' => 130600,'area_name' => '雄县','lng' => 116.109,'lat' => 38.9944],['area_id' => 130681,'area_pid' => 130600,'area_name' => '涿州市','lng' => 115.981,'lat' => 39.4862],['area_id' => 130682,'area_pid' => 130600,'area_name' => '定州市','lng' => 114.99,'lat' => 38.5162],['area_id' => 130683,'area_pid' => 130600,'area_name' => '安国市','lng' => 115.323,'lat' => 38.4139],['area_id' => 130684,'area_pid' => 130600,'area_name' => '高碑店市','lng' => 115.874,'lat' => 39.3265]]],['area_id' => 130700,'area_pid' => 130000,'area_name' => '张家口市','lng' => 114.884,'lat' => 40.8119,'son' => [['area_id' => 130702,'area_pid' => 130700,'area_name' => '桥东区','lng' => 114.894,'lat' => 40.7884],['area_id' => 130703,'area_pid' => 130700,'area_name' => '桥西区','lng' => 114.87,'lat' => 40.8195],['area_id' => 130705,'area_pid' => 130700,'area_name' => '宣化区','lng' => 115.065,'lat' => 40.6096],['area_id' => 130706,'area_pid' => 130700,'area_name' => '下花园区','lng' => 115.287,'lat' => 40.5024],['area_id' => 130721,'area_pid' => 130700,'area_name' => '宣化县','lng' => 115.155,'lat' => 40.5662],['area_id' => 130722,'area_pid' => 130700,'area_name' => '张北县','lng' => 114.714,'lat' => 41.1598],['area_id' => 130723,'area_pid' => 130700,'area_name' => '康保县','lng' => 114.6,'lat' => 41.8522],['area_id' => 130724,'area_pid' => 130700,'area_name' => '沽源县','lng' => 115.689,'lat' => 41.6696],['area_id' => 130725,'area_pid' => 130700,'area_name' => '尚义县','lng' => 113.971,'lat' => 41.0778],['area_id' => 130726,'area_pid' => 130700,'area_name' => '蔚县','lng' => 114.589,'lat' => 39.8407],['area_id' => 130727,'area_pid' => 130700,'area_name' => '阳原县','lng' => 114.151,'lat' => 40.1036],['area_id' => 130728,'area_pid' => 130700,'area_name' => '怀安县','lng' => 114.386,'lat' => 40.6743],['area_id' => 130729,'area_pid' => 130700,'area_name' => '万全县','lng' => 114.741,'lat' => 40.7669],['area_id' => 130730,'area_pid' => 130700,'area_name' => '怀来县','lng' => 115.518,'lat' => 40.4154],['area_id' => 130731,'area_pid' => 130700,'area_name' => '涿鹿县','lng' => 115.224,'lat' => 40.3764],['area_id' => 130732,'area_pid' => 130700,'area_name' => '赤城县','lng' => 115.832,'lat' => 40.9144],['area_id' => 130733,'area_pid' => 130700,'area_name' => '崇礼县','lng' => 115.28,'lat' => 40.9752]]],['area_id' => 130800,'area_pid' => 130000,'area_name' => '承德市','lng' => 117.939,'lat' => 40.9762,'son' => [['area_id' => 130802,'area_pid' => 130800,'area_name' => '双桥区','lng' => 117.943,'lat' => 40.9747],['area_id' => 130803,'area_pid' => 130800,'area_name' => '双滦区','lng' => 117.745,'lat' => 40.9538],['area_id' => 130804,'area_pid' => 130800,'area_name' => '鹰手营子矿区','lng' => 117.66,'lat' => 40.5474],['area_id' => 130821,'area_pid' => 130800,'area_name' => '承德县','lng' => 118.176,'lat' => 40.7699],['area_id' => 130822,'area_pid' => 130800,'area_name' => '兴隆县','lng' => 117.501,'lat' => 40.4171],['area_id' => 130823,'area_pid' => 130800,'area_name' => '平泉县','lng' => 118.702,'lat' => 41.0184],['area_id' => 130824,'area_pid' => 130800,'area_name' => '滦平县','lng' => 117.333,'lat' => 40.9415],['area_id' => 130825,'area_pid' => 130800,'area_name' => '隆化县','lng' => 117.73,'lat' => 41.3141],['area_id' => 130826,'area_pid' => 130800,'area_name' => '丰宁满族自治县','lng' => 116.649,'lat' => 41.2048],['area_id' => 130827,'area_pid' => 130800,'area_name' => '宽城满族自治县','lng' => 118.492,'lat' => 40.6083],['area_id' => 130828,'area_pid' => 130800,'area_name' => '围场满族蒙古族自治县','lng' => 117.76,'lat' => 41.9437]]],['area_id' => 130900,'area_pid' => 130000,'area_name' => '沧州市','lng' => 116.857,'lat' => 38.3106,'son' => [['area_id' => 130902,'area_pid' => 130900,'area_name' => '新华区','lng' => 116.866,'lat' => 38.3144],['area_id' => 130903,'area_pid' => 130900,'area_name' => '运河区','lng' => 116.857,'lat' => 38.3135],['area_id' => 130921,'area_pid' => 130900,'area_name' => '沧县','lng' => 116.878,'lat' => 38.2936],['area_id' => 130922,'area_pid' => 130900,'area_name' => '青县','lng' => 116.803,'lat' => 38.5835],['area_id' => 130923,'area_pid' => 130900,'area_name' => '东光县','lng' => 116.537,'lat' => 37.8857],['area_id' => 130924,'area_pid' => 130900,'area_name' => '海兴县','lng' => 117.498,'lat' => 38.1396],['area_id' => 130925,'area_pid' => 130900,'area_name' => '盐山县','lng' => 117.231,'lat' => 38.0565],['area_id' => 130926,'area_pid' => 130900,'area_name' => '肃宁县','lng' => 115.83,'lat' => 38.4227],['area_id' => 130927,'area_pid' => 130900,'area_name' => '南皮县','lng' => 116.702,'lat' => 38.0411],['area_id' => 130928,'area_pid' => 130900,'area_name' => '吴桥县','lng' => 116.385,'lat' => 37.6255],['area_id' => 130929,'area_pid' => 130900,'area_name' => '献县','lng' => 116.127,'lat' => 38.1923],['area_id' => 130930,'area_pid' => 130900,'area_name' => '孟村回族自治县','lng' => 117.104,'lat' => 38.0534],['area_id' => 130981,'area_pid' => 130900,'area_name' => '泊头市','lng' => 116.578,'lat' => 38.0836],['area_id' => 130982,'area_pid' => 130900,'area_name' => '任丘市','lng' => 116.103,'lat' => 38.7112],['area_id' => 130983,'area_pid' => 130900,'area_name' => '黄骅市','lng' => 117.339,'lat' => 38.3706],['area_id' => 130984,'area_pid' => 130900,'area_name' => '河间市','lng' => 116.099,'lat' => 38.4455]]],['area_id' => 131000,'area_pid' => 130000,'area_name' => '廊坊市','lng' => 116.714,'lat' => 39.5292,'son' => [['area_id' => 131002,'area_pid' => 131000,'area_name' => '安次区','lng' => 116.703,'lat' => 39.5206],['area_id' => 131003,'area_pid' => 131000,'area_name' => '广阳区','lng' => 116.711,'lat' => 39.5228],['area_id' => 131022,'area_pid' => 131000,'area_name' => '固安县','lng' => 116.299,'lat' => 39.4383],['area_id' => 131023,'area_pid' => 131000,'area_name' => '永清县','lng' => 116.501,'lat' => 39.3207],['area_id' => 131024,'area_pid' => 131000,'area_name' => '香河县','lng' => 117.006,'lat' => 39.7613],['area_id' => 131025,'area_pid' => 131000,'area_name' => '大城县','lng' => 116.654,'lat' => 38.7053],['area_id' => 131026,'area_pid' => 131000,'area_name' => '文安县','lng' => 116.458,'lat' => 38.8732],['area_id' => 131028,'area_pid' => 131000,'area_name' => '大厂回族自治县','lng' => 116.989,'lat' => 39.8865],['area_id' => 131081,'area_pid' => 131000,'area_name' => '霸州市','lng' => 116.392,'lat' => 39.1257],['area_id' => 131082,'area_pid' => 131000,'area_name' => '三河市','lng' => 117.072,'lat' => 39.9836]]],['area_id' => 131100,'area_pid' => 130000,'area_name' => '衡水市','lng' => 115.666,'lat' => 37.7351,'son' => [['area_id' => 131102,'area_pid' => 131100,'area_name' => '桃城区','lng' => 115.675,'lat' => 37.735,],['area_id' => 131121,'area_pid' => 131100,'area_name' => '枣强县','lng' => 115.726,'lat' => 37.5103],['area_id' => 131122,'area_pid' => 131100,'area_name' => '武邑县','lng' => 115.887,'lat' => 37.8018],['area_id' => 131123,'area_pid' => 131100,'area_name' => '武强县','lng' => 115.982,'lat' => 38.0414],['area_id' => 131124,'area_pid' => 131100,'area_name' => '饶阳县','lng' => 115.726,'lat' => 38.2353],['area_id' => 131125,'area_pid' => 131100,'area_name' => '安平县','lng' => 115.519,'lat' => 38.2339],['area_id' => 131126,'area_pid' => 131100,'area_name' => '故城县','lng' => 115.971,'lat' => 37.3477],['area_id' => 131127,'area_pid' => 131100,'area_name' => '景县','lng' => 116.269,'lat' => 37.6926],['area_id' => 131128,'area_pid' => 131100,'area_name' => '阜城县','lng' => 116.144,'lat' => 37.8688],['area_id' => 131181,'area_pid' => 131100,'area_name' => '冀州市','lng' => 115.579,'lat' => 37.5508],['area_id' => 131182,'area_pid' => 131100,'area_name' => '深州市','lng' => 115.56,'lat' => 38.0011]]]]]];<label for="ssq">省市区</label><select name="ssq" id="ssq" ><?php//一级循环读省foreach($arr as $key => $value){echo ' <option name="province" value ="'.$value['area_id'].'">'.'---'.$value['area_name'].'</option>';foreach($value['son'] as $key2 => $value2){echo ' <option name="city" value ="'.$value2['area_id'].'">'.'------'.$value2['area_name'].'</option>';foreach($value2['son'] as $key3 => $value3){echo ' <option name="districts" value ="'.$value3['area_id'].'">'.'---------'.$value3['area_name'].'</option>';}}}?></select>
二、phpstudy
- 进入phpstudy
开启Apache+ Mysql
- 进入phpstudy
- 建立一个网站
- 3.点击“设置”—“配置文件”—“hosts”
如果失败请设置权限
三、常量定义
- define( “APP_NAME”, “HTML中文网” ); 不能重新赋值
四、创建数组两种方式
- 1、$arr = array();
- 2、$arr=[];
五、数组的打印
- 用var_dump 是打印数组的类型和值
- print_r 打印数组的值，在数组调试的时候，都会用这个函数
- echo 只能打印一个 单数值，多数值不行 多用print_r查看
六、引索数组
- 下标：也叫做key，默认从0开始 叫索引数组：默认从0开始，都是数字
$arr = [
];1 => '欧阳克',2 => '灭绝师太'
七、关联数组
$arr = ['ouyangke' => '欧阳克','miejue' => '灭绝师太'];
八、字符集
- header(“Content-Type:text/html;charset=utf-8”);
九、数组赋值
- 一维数组存放无规律
- 二维数组存放有规律
- 三维数组层级越多,越难理解，尽量不要超过3层
三维数组和二维数组，都要用关联下标，第一层可以用索引下标
$php = [
‘欧阳克’,
‘灭绝师太’,
‘zhulaoshi’ => ‘朱老师’,'ximen' => '西门大官人',
// 我们都以为钟老师 的下标应该是4，结果是2
//‘钟老师’];
```gongfu 就是关联下标$php = [['name' => '欧阳克','age' => '38岁','gongfu' => ['php基础','小程序']],['name' => '灭绝师太','age' => '18岁','gongfu' => ['uniAPP','小程序','vuejs']],['name' => '朱老师','age' => '48岁','合肥',['HTML基础','CSS基础','js基础']],['name' => '西门大官人','age' => '28岁',['商城实战','小程序实战'],'芜湖']];```