Is it possible to find the key name (key) in a php array by value?

php array can find the corresponding key name (key) by value. Two search methods: 1. Use "array_search(value, array)", which will return the corresponding key name; 2. Use "foreach($arr as $k=>$v){if($v==value){ echo $k;}}", which can output the corresponding key name.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php array can be found by value The corresponding key name (key).

The following article will introduce to you two search methods.

Method 1: Use array_search() function

array_search() function can search for the specified key value in the array and return the corresponding key name.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array("id"=>1,"name"=>"李华","age"=>23);
var_dump($arr);
echo "指定值&#39;李华&#39;对应的键名为：".array_search("李华",$arr);
?>

Method 2: Use the foreach statement to traverse the array and search

• Use the foreach statement to traverse the array

• In the loop body, use the "==" operator to check whether the specified value is in the element. If it is, return the corresponding key name

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array("id"=>1,"name"=>"张三","age"=>23);
var_dump($arr);
foreach ($arr as $key => $value){
    if($value==23){
    	echo "指定值&#39;23&#39;对应的键名为：".$key;
    }
}
?>

Recommended study: "PHP Video Tutorial"

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