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array_diff_key ( ) - Find unique keys when comparing arrays
The array_diff_key() PHP array function will find unique keys in a target array when you compare other arrays against it. All arrays used are put against the target array for evaluation, and you can feed as many arrays as you like into this function as parameters. If key matches are found they are not placed into the output array. Only unique keys are placed into the output array. This function only evaluates array keys and does not evaluate any values for those keys. To evaluate both keys and values in this way use the array_diff_assoc() function instead of this one.

It will take as many arrays as parameters that you wish to compare with the target array. Parameter one is the target array, and all arrays to be evaluated for differences against the target are to be used as parameters following the first and separated by commas.

array_diff_key() will return an associative array containing any unique keys(and their values) found after it processes.


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= array("myKey1" => 25"myKey2" => 12"myKey3" => 34);
$compArray = array("myKey1" => 30"myKey2" => 47"myKey6" => 93);
$newArray array_diff_key($targetArray$compArray);

foreach (
$newArray as $key => $value) {
"$key - <strong>$value</strong> <br />"

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myKey3 - 34 

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CSS Level 3 Properties is a growing educational system packed with video and written material that you can access 24/7 100% free. The focus here in 2014 is spread between five technologies: HTML, CSS, JavaScript, PHP and MySQL. Learn programming theory, database interaction, web design, animation, graphics editing, vector art, 3D modeling, and much more. The educational experience here is a hybrid one offering both high quality video tutorials and code libraries that grow more robust every day. The code libraries are being assembled so that developers can discover all of the building blocks of their favorite languages. The libraries coupled with high quality video tutorials will take you deep down the rabbit hole very quickly. You can also ask questions and get free advice at