php error_reporting() sets the error reporting level

* For now, avoid warnings of E_STRICT mode
* (this must be done before function definitions)
*/
if (defined('E_STRICT')) {
 $old_error_reporting = error_reporting(0);
 if ($old_error_reporting & E_STRICT) {
 error_reporting($old_error_reporting ^ E_STRICT);
 } else {
 error_reporting($old_error_reporting);
 }
 unset($old_error_reporting);

Common ones are as follows:

// Turn off all error reporting; Turn off all errors
error_reporting(0);
// Report simple running errors; Report a simple running errors 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 …); including reporting some uninitialized
// variables or catch variable name misspellings …); Initialized variables or catching typos in variable names
error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);
// Report all errors except E_NOTICE
// This is the default value set in php .ini;Report all errors but not E_NOTICE
error_reporting(E_ALL ^ ​​E_NOTICE);
// Report all PHP errors (bitwise 63 may be used in PHP 3);Report all errors< ;/p>
error_reporting(E_ALL);
// Same as error_reporting(E_ALL); Same as above
ini_set('error_reporting', E_ALL);

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