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Code to check for a key inside a deep array
<?php
//deep search array for key
function multi_key_exists( array $arr, $key ){
// is in base array?
if ( array_key_exists($key, $arr) ) return true;
// check arrays contained in this array
foreach( $arr as $element ){
if( is_array($element) && multi_key_exists($element, $key) ){
return true;
}
}
return false;
}
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