Unsetting array elements safely in PHP.

gistfile1.php

<?php

$my_array = array( 'foo', 'bar', 'baz' );

// $key is index
foreach( $array as $key => $val ) { 
  if ($val == 'foo') { 
    unset( $key);
  }
}

// => array( 'bar', 'baz' );

$my_other_array = array( 'foo' => 1, 'bar' => 2, 'baz' => 3 );

foreach( $my_other_array as $key => $val ) {
  if ($key == 'foo') { 
    unset( $key);
  } 
}

// => array( 'bar' => 2, 'baz' => 3 )