internals2-php-opcodes-php-fetch-is-9

  • Opcode Descriptions and
    Examples

    • FETCH_IS

  • FETCH_IS

    • FETCH_IS

    FETCH_IS

    PHP code

    <?php
    /*
     * Fetch the value from variable which is to be used to test if it is set or not, through isset()/isempty().
     * opcode number: 89
     */
    echo isset($_SESSION['userid']);
    echo isset(    $_SESSION['userid'][1]);
    echo isset(    $_SESSION->prop->prop);
    ?>

    PHP opcodes

    Function name: (null)

    Compiled variables: none

    line # op fetch ext return operands
    6 0 FETCH_IS     $0 ‘_SESSION’
      1 ZEND_ISSET_ISEMPTY_DIM_OBJ   1 ~1 $0,’userid’
      2 ECHO       ~1
    7 3 FETCH_IS     $2 ‘_SESSION’
      4 FETCH_DIM_IS     $3 $2,’userid’
      5 ZEND_ISSET_ISEMPTY_DIM_OBJ   1 ~4 $3,1
      6 ECHO       ~4
    8 7 FETCH_IS     $5 ‘_SESSION’
      8 FETCH_OBJ_IS     $6 $5,’prop’
      9 ZEND_ISSET_ISEMPTY_PROP_OBJ     ~7 $6,’prop’
      10 ECHO       ~7
    9 11 RETURN       1