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Error Reporting

Error reporting is the process to report any issue while executing the code. It is also the name of the eponymous function error_reporting() and also a php.ini directive: error_reporting. They all control the way errors are handled.

Error reporting is set by calling the error_reporting() function, with a combination of constants: E_ERROR, E_WARNING, E_PARSE, E_NOTICE, E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR, E_COMPILE_WARNING, E_USER_ERROR, E_USER_WARNING, E_USER_NOTICE, E_STRICT, E_RECOVERABLE_ERROR, E_DEPRECATED, E_USER_DEPRECATED, E_ALL. They are combined as a bitfield, or may be replaced by their integer counterpart. One special value is -1, which is the universal error reporting: it activates all types of errors, past present and future.

error_reporting, the directive, is set in the php.ini file. It doesn’t support the bitfield, so it must be set as an integer.

<?php

    // Turn off all error reporting
    error_reporting(0);
    
    // Report simple running errors
    error_reporting(E_ERROR | E_WARNING | E_PARSE);
    
    // Reporting E_NOTICE can be good too (to report uninitialized
    // variables or catch variable name misspellings ...)
    error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);
    
    // Report all errors except E_NOTICE
    error_reporting(E_ALL & ~E_NOTICE);

?>

Documentation

See Also