Unset an item from an array by its value.

unset_by_value.php

<?php

/**
 * Unset an item from an array by its value.
 */
function unset_byvalue(array $array = array(), $value = '') {
  $index = array_search($value, $array, TRUE);
  if ($index !== FALSE) {
    unset($array[$index]);
  }

  return $array;
}


// Usage example.
// Remove `two` from the list:
$classes_array = array('one', 'two', 'three');
$new_classes_array = unset_byvalue($classes, 'two');