Check if the key of the array is valid and return it.

isset_get()

<?php
function isset_get( $array, $key, $default = null ) {
    return isset( $array[ $key ] ) ? $array[ $key ] : $default;
}

/*
 * In Wordpress, the most common PHP warning is when it uses an array index without check if that index is valid.
 * So, you have to ask if the array index is valid:
 *      if( isset( $array['index'] ) )
 * And then you can use it:
 *      $value = $array['index']
 * 
 * With this function you can check and get the value of the array and custom the default value
 *      $value = isset_get( $array, 'index' );
 *      $value = isset_get( $array, 'index', false );
 */