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array_search()

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<?php
$mixed 
array_search (
    
// mixed $needle
    
// array $haystack
    
?  // [bool $strict = false]
);
?>
Result
$mixed = 1
Examples
#1 array_search  ("green",
 [
=> "blue"=> "red"=> "green"=> "red"])
#2 array_search  ("red",
 [
=> "blue"=> "red"=> "green"=> "red"])
See also
array_key_exists, array_keys, array_values, in_array