How to query a value in an array in php

In PHP, you can use the array_search() function to query a certain value in the array, with the syntax "array_search("element", array)"; this function searches for a key value in the array. If the specified key value is found in the array, the corresponding key name is returned; if not found, false is returned.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

<?php

$a=array("a"=>"Dog","b"=>"Cat");
if(array_key_exists("a",$a)){
    echo "Key exists!";
}else{
    echo "Key does not exist!";
}

$a=array("a"=>"Dog","b"=>"Cat","c"=>5,"d"=>"5");
echo array_search("Dog",$a);
echo array_search("5",$a);
?>

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