PHP Search for a given simple instance in an array array array

array_search()

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

grammar:

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

parameter	illustrate
needle	The value that needs to be searched in the array, if it is a string, it is case sensitive
array	Arrays to be retrieved
strict	Optional, if set to TRUE, the value types in the needle and array are also checked

Since the starting index number of the index array may be 0 , the function may also return non-boolean values equivalent to FALSE, such as 0 or "", so the === operator needs to be used to strictly check the value returned by the function.

example:

&lt;?php
$arr_a = array(0 =&gt; "a", 1 =&gt; "b", 2 =&gt; "c");
$key = array_search("a", $arr_a);
if( $key !== FALSE ){
  echo "Key name: $key";
} else {
  echo 'No matching result';
}
?&gt;

The example output results are as follows:

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

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PHP Search for a given simple instance in an array array array_search function