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    PHP – how to catch errors using set_error_handler

    By admin on Jan 15, 2016

    PHP set_error_handler can catch various type of php errors in a specific portion of the code. To restore the previous error hander one can call restore_error_handler function. Here is a sample code snippet and its outcome.

    <?php
    function my_error_handler ($errno, $errstr, $errfile, $errline) {
      echo "errstr=$errstr";
      // return true to bypass  standard php error handler
      return true;
    }
    set_error_handler('my_error_handler', E_ALL | E_STRICT);
    // this will cause warning due to bad regex
    $ret = preg_match("abc", "abcdef");
    restore_error_handler();
    ?>
    errstr=preg_match(): Delimiter must not be alphanumeric or backslash
    Env: PHP 7.3.18 (Linux)

    Few points to note

    1. Returning true from error handler will bypass php standard error handler.
    2. restore_error_handler will restore previous hander. In our case default php error handler.
    3. It is pretty useful in case you are executing code obtained from thord party.

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    Posted in Tutorials | Tagged PHP, PHP cookbook, Tutorials

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