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.

1,"name"=>"李华","age"=>23); var_dump($arr); echo "指定值'李华'对应的键名为：".array_search("李华",$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

1,"name"=>"张三","age"=>23); var_dump($arr); foreach ($arr as $key => $value){ if($value==23){ echo "指定值'23'对应的键名为：".$key; } } ?>

Recommended study: "PHP Video Tutorial"

The above is the detailed content of Is it possible to find the key name (key) in a php array by value?. For more information, please follow other related articles on the PHP Chinese website!