PHP and JavaScript respectively obtain the key values ​​​​of associative arrays sample code_PHP tutorial

PHP version:

Copy code The code is as follows:

$o = array('x'=>1, 'y '=>2, 'z'=>3);
$arr = array();
$i = 0;
foreach( $o as $arr[$i++]=> $v )/*empty*/;
var_dump($arr); //$arr = array('x', 'y', 'z');

JavaScript version:

Copy code The code is as follows:

var o = {x:1, y:2, z:3};
var arr = [], i = 0;
for ( arr[i++] in o ) /*empty*/ ;
console.log( arr ); //arr = ['x', ' y', 'z'];

http://www.bkjia.com/PHPjc/313623.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/313623.htmlTechArticlePHP version: Copy the code as follows: $o = array('x'=1, 'y'=2 , 'z'=3); $arr = array(); $i = 0; foreach( $o as $arr[$i++]=$v )/*empty*/; var_dump($arr); //$ arr = array('x', 'y', 'z');...