this article will introduce you to the method of formatting php json data. it has certain reference value. friends in need can refer to it. i hope it will be helpful to everyone.
php's json_encode can convert the array into a string in json format. the string is not indented, and chinese characters will be converted to unicode encoding, such as \u975a\u4ed4. it is difficult for people to read.
now this method is beautified again based on json_encode. make it easier for people to read the content.
1. use json_encode output
<?php header('content-type:application/json;charset=utf8'); $arr = array( 'status' => true, 'errmsg' => '', 'member' =>array( array( 'name' => '张三', 'gender' => '男' ), array( 'name' => '李四', 'gender' => '女' ) ) ); echo json_encode($arr); ?>
output:
{"status":true,"errmsg":"","member":[{"name":"\u674e\u900d\u9065","gender":"\u7537"},{"name":"\u8d75\u7075\u513f","gender":"\u5973"}]}
it can be seen that this format is very difficult for people to read.
2. use jsonformat to output
<?php /** json数据格式化 * @param mixed $data 数据 * @param string $indent 缩进字符,默认4个空格 * @return json */ function jsonformat($data, $indent=null){ // 对数组中每个元素递归进行urlencode操作,保护中文字符 array_walk_recursive($data, 'jsonformatprotect'); // json encode $data = json_encode($data); // 将urlencode的内容进行urldecode $data = urldecode($data); // 缩进处理 $ret = ''; $pos = 0; $length = strlen($data); $indent = isset($indent)? $indent : ' '; $newline = "\n"; $prevchar = ''; $outofquotes = true; for($i=0; $i<=$length; $i++){ $char = substr($data, $i, 1); if($char=='"' && $prevchar!='\\'){ $outofquotes = !$outofquotes; }elseif(($char=='}' || $char==']') && $outofquotes){ $ret .= $newline; $pos --; for($j=0; $j<$pos; $j++){ $ret .= $indent; } } $ret .= $char; if(($char==',' || $char=='{' || $char=='[') && $outofquotes){ $ret .= $newline; if($char=='{' || $char=='['){ $pos ++; } for($j=0; $j<$pos; $j++){ $ret .= $indent; } } $prevchar = $char; } return $ret; } /** 将数组元素进行urlencode * @param string $val */ function jsonformatprotect(&$val){ if($val!==true && $val!==false && $val!==null){ $val = urlencode($val); } } header('content-type:application/json;charset=utf8'); $arr = array( 'status' => true, 'errmsg' => '', 'member' =>array( array( 'name' => '张三', 'gender' => '男' ), array( 'name' => '李四', 'gender' => '女' ) ) ); echo jsonformat($arr); ?>
output:
{ "status":true, "errmsg":"", "member":[ { "name":"张三", "gender":"男" }, { "name":"李四", "gender":"女" } ] }
after php5.4, json_encode adds json_unescaped_unicode, json_pretty_print, etc. a constant parameter. make displaying chinese and formatting more convenient.
header('content-type:application/json;charset=utf8'); $arr = array( 'status' => true, 'errmsg' => '', 'member' =>array( array( 'name' => '张三', 'gender' => '男' ), array( 'name' => '李四', 'gender' => '女' ) ) ); echo json_encode($arr, json_unescaped_unicode|json_pretty_print);
output:
{ "status": true, "errmsg": "", "member": [ { "name": "张三", "gender": "男" }, { "name": "李四", "gender": "女" } ] }
json constant parameter description: the following constants represent the error type returned by json_last_error().
json_error_none (integer)
no error occurred. effective as of php 5.3.0.
json_error_depth (integer)
the maximum stack depth has been reached. effective as of php 5.3.0.
json_error_state_mismatch (integer)
an underflow or pattern mismatch occurred. effective as of php 5.3.0.
json_error_ctrl_char (integer)
the control character is wrong, maybe the encoding is wrong. effective as of php 5.3.0.
json_error_syntax (integer)
syntax error. effective as of php 5.3.0.
json_error_utf8 (integer)
exceptional utf-8 characters, perhaps due to incorrect encoding. this constant is available since php 5.3.1.
the following constants can be used in conjunction with the form option of json_encode().
json_hex_tag (integer)
all are converted to \u003c and \u003e. effective as of php 5.3.0.
json_hex_amp (integer)
all &s are converted to \u0026. effective as of php 5.3.0.
json_hex_apos (integer)
all ' are converted to \u0027. effective as of php 5.3.0.
json_hex_quot (integer)
all " are converted to \u0022. effective since php 5.3.0.
json_force_object (integer)
causes a non-associative array to output a class (object) instead of an array. in the array: especially useful when empty and the receiver requires an object. effective as of php 5.3.0.
json_numeric_check (integer)
encode all numeric strings into numbers. effective as of php 5.3.3 .
json_bigint_as_string (integer)
encode large numbers into the original value of the original character. effective since php 5.4.0.
json_pretty_print (integer)
format the returned data with whitespace characters. since php 5.4.0 effective as of php 5.4.0.
json_unescaped_slashes (integer)
do not encode /. effective as of php 5.4.0.
JSON_UNESCAPED_UNICODE (integer)
encode multibyte unicode characters literally (the default is to encode \uxxxx). since php effective from 5.4.0.
recommended learning: "php video tutorial" p>

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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