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array_filter ( ) - Filter array elements using a callback function
The array_filter() array function in PHP will filter elements of an array by using a callback function we can put into place in our script. For normal use it requires two parameters. The first parameter is the array to be filtered. The second parameter is the name of the callback function you wish to execute.

My callback function is a little function I wrote custom that will help me filter out all non string elements. So if I needed a way to keep only strings in my array and remove everything else, I could use this approach as my array filter.

Learn HTML
// Callback function that is sent values from the array_filter() function
// This lies dormant until we run the array_filter() function below
function evalstr ($x) {
    if (
is_string($x)) { // Evaluate if this element is a string
        return true;
// Array that you want to run through the function
$myArray = array("Jack",4,"Paul",9);
// Run the array_filter function which fires off our function above
$newArray array_filter($myArray"evalstr");
// The $newArray elements will be filtered by your custom code
foreach ($newArray as $key => $value) {
"$key - <strong>$value</strong> <br />"

Develop PHP browser display window
0 - Jack 
2 - Paul 

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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