How to find the subscript of a number in an array in php

Two methods to find subscripts: 1. Use array_search(), the syntax "array_search(specified number, $arr)", which will return the corresponding key name (subscript); 2. Use array_keys(), the syntax "array_keys($arr, specified number)" will return the corresponding subscript in the form of an array.

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

Array array is a set of ordered variables. Each value is called an element. Each element is distinguished by a special identifier called a key (also called a subscript).

php method to find the subscript (key name) of a certain number in an array

Method 1: Use the array_search() function

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

• If a key value is found more than once in the array, the key name matching the first found key value is returned.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(34,43,1,32,12,89,32,45,8,4);
var_dump($arr);
echo "指定数&#39;89&#39;对应的下标为：".array_search(89,$arr);
?>

Method 2: Use the array_keys() function

array_key() function to get the array some or all of the key names.

If the array_key() function specifies the second parameter $search_value, the function will only return the key name with the value $search_value.

array_key() function will return the obtained array key name in the form of an array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(34,43,1,32,12,89,32,45,8,4);
var_dump($arr);
echo "指定数&#39;12&#39;对应的下标为：";
var_dump(array_keys($arr,12));
?>

Recommended learning: "PHP Video Tutorial", "PHP ARRAY"

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