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in_array()

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<?php
$bool 
in_array (
    
// mixed $needle
    
// array $haystack
    
?  // [bool $strict = FALSE]
);
?>
Result
$bool = true
Examples
#1 in_array  ("Irix",
 [
=> "Mac"=> "NT"=> "Irix"=> "Linux"])
#2 in_array  ("mac",
 [
=> "Mac"=> "NT"=> "Irix"=> "Linux"])
#3 in_array  ("12.4",
 [
=> "1.10"=> 12.4=> 1.13],
 
true)
#4 in_array  (1.13,
 [
=> "1.10"=> 12.4=> 1.13],
 
true)
#5 in_array  ([=> "p"=> "h"],
 [
=> [=> "p"=> "h"], => [=> "p"=> "r"], => "o"])
#6 in_array  ([=> "f"=> "i"],
 [
=> [=> "p"=> "h"], => [=> "p"=> "r"], => "o"])
#7 in_array  ("o",
 [
=> [=> "p"=> "h"], => [=> "p"=> "r"], => "o"])
See also
array_key_exists, array_search