filters-php-string-7

  • List of Available Filters

    • String Filters

  • String Filters

    • String Filters

    String Filters

    Each of these filters does precisely what their
    name implies and correspond to the behavior of a built-in php
    string handling function. For more information on a given filter,
    refer to the manual page for the corresponding function.

    string.rot13 Use of this filter is
    equivalent to processing all stream data through the str_rot13() function.

    Example #1 string.rot13

    <?php
    $fp     = fopen('php://output', 'w');
    stream_filter_append($fp, 'string.rot13');
    fwrite($fp, "This is a test.\n");
    /* Outputs:  Guvf vf n grfg.   */
    ?>

    string.toupper Use of this filter is
    equivalent to processing all stream data through the strtoupper() function.

    Example #2 string.toupper

    <?php
    $fp     = fopen('php://output', 'w');
    stream_filter_append($fp, 'string.toupper');
    fwrite($fp, "This is a test.\n");
    /* Outputs:  THIS IS A TEST.   */
    ?>

    string.tolower Use of this filter is
    equivalent to processing all stream data through the strtolower() function.

    Example #3 string.tolower

    <?php
    $fp     = fopen('php://output', 'w');
    stream_filter_append($fp, 'string.tolower');
    fwrite($fp, "This is a test.\n");
    /* Outputs:  this is a test.   */
    ?>

    string.strip_tags Use of this filter is
    equivalent to processing all stream data through the strip_tags() function. It accepts parameters
    in one of two forms: Either as a string containing a list of tags
    similar to the second parameter of the strip_tags() function, or as an array of tag
    names.

    Warning

    This feature has been DEPRECATED as of PHP 7.3.0. Relying on this feature
    is highly discouraged.

    Example #4 string.strip_tags

    <?php
    $fp     = fopen('php://output', 'w');
    stream_filter_append($fp, 'string.strip_tags', STREAM_FILTER_WRITE, "<b><i><u>");
    fwrite($fp, "<b>bolded text</b> enlarged to a <h1>level 1 heading</h1>\n");
    fclose($fp);
    /* Outputs:  <b>bolded text</b> enlarged to a level 1 heading   */

    $fp = fopen('php://output', 'w');
    stream_filter_append($fp, 'string.strip_tags', STREAM_FILTER_WRITE, array('b','i','u'));
    fwrite($fp, "<b>bolded text</b> enlarged to a <h1>level 1 heading</h1>\n");
    fclose($fp);
    /* Outputs:  <b>bolded text</b> enlarged to a level 1 heading   */
    ?>