<?php //请创建一个数组变量arr,并尝试创建一个索引数组 /** * 不带初始值的创建,创建后赋予值 * 注:下标一定是整数 */ $arr = array(); $arr[0] = '老大'; $arr[1] = '老二'; if(isset($arr)){print_r($arr);} /** * 带初始值的创建 */ //可用双引号,或者单引号,数组是从0开始的 $arr2 = array("老大",'老二'); if(isset($arr2)){print_r($arr2);} //左边是键,右边是键值 $arr3 = array('0'=>'老大','2'=>'老三','1'=>'老二'); if( isset($arr3) ) {print_r($arr3);} ?>
<?php //从数组变量$arr中,读取键为0的值 $arr = array('老大','老二'); //$arr0 = $arr['0']; $arr0 = $arr[0]; if( isset($arr0) ) {print_r($arr0);} ?>
//直接通过index访问<?php $arr = array('张三','李四','王二'); for( $i = 0;$i < 3;$i++){ echo $arr[$i].'<br><br>'; } ?>
//通过foreach循环访问数组里的值<?php$arr = array('i'=>"我",'love'=>'爱','u'=>'你');if(isset($arr)){ foreach($arr as $key=>$value) { echo $value.' '; }}?>
总结
PHP数组分为 索引数组 关联数组
关联数组是 键值是字符串的数组
例如 上例中关于foreach的举例。
<?php$arr = array( 'wo'=>"我", 'love'=>'爱', 'li'=>'莉' ); if(isset($arr)) { foreach($arr as $key=>$value) { print_r($value); //echo $value; } }?>
<?php//$arr = array('apple'=>'苹果');$arr = array();$arr['apple'] = '苹果';if( isset($arr) ) {print_r($arr);}?>
<?php$arr = array('apple'=>"苹果",'banana'=>"香蕉",'pineapple'=>"菠萝");$arr0 = $arr['apple'];if( isset($arr0) ) {print_r($arr0);}?>

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