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:

Parameter	Description
needle	The value that needs to be searched in the array , if it is a string, it is case-sensitive
array	The array to be retrieved
strict	Optional, if set to TRUE, the value type in needle and array will also be checked

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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