PHP searches an array for a given simple instance array_search function

array_search()

PHP array_search() function is used to search for a given value in an array, and returns the corresponding key name if successful, otherwise it returns FALSE.

Syntax:

mixed array_search( mixed needle, array array [, bool strict] ) Parameter description:

Since the starting index number of the index array may be 0, the function may also return a non-boolean value equivalent to FALSE, such as 0 or "", so you need to use the === operator to compare the values ​​returned by the function Values ​​are strictly verified.

Example:

<&#63;php
$arr_a = array(0 => "a", 1 => "b", 2 => "c");
$key = array_search("a", $arr_a);
if( $key !== FALSE ){
  echo "键名为：$key";
} else {
  echo '无匹配结果';
}
?>

The example output is as follows:

Key name: 0 If needle appears more than once in array, the first matching key is returned. To return the keys of all matching values, use the array_keys() function.

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