PHP inserts header (& #39; content-type: text/html; charset = & quot; UTF-8 & #39;) and error_reporting (),

PHP inserts header ('content-type: text/html; charset = "UTF-8 ') and error_reporting (),

1. header

PHP file insert header ("Content-type: text/html; charset = UTF-8 ");
Equivalent to <meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8">;
Objective: To prevent page garbled characters

2. error_reporting

Definition and usage: error_reporting () sets the PHP error level and returns the current level.
Function Syntax: error_reporting (report_level)
If the level parameter is not specified, the current error level is returned. The following items are possible values of level:
Value constant description

1: Fatal run error of E_ERROR. The error cannot be recovered. The script is paused. 2: E_WARNING runtime warning (non-fatal error ). Non-fatal running error. script execution will not stop. 4: parsing error during E_PARSE compilation. Parsing errors are only generated by the analyzer. 8: E_NOTICE runtime reminder (these are often caused by bugs in your code, and may also be caused by intentional behavior .) 16: Fatal error during initialization of E_CORE_ERROR PHP. 32: Warning during initialization (non-fatal error) during E_CORE_WARNING PHP startup ). 64: E_COMPILE_ERROR fatal error during compilation. This is like an E_ERROR generated by the Zend script engine. 128: warning when compiling E_COMPILE_WARNING (non-fatal error ). This is like an E_WARNING warning generated by the Zend script engine. 256: User-Defined error message for E_USER_ERROR. This is like a custom warning message by using the PHP function trigger_error (the programmer sets E_ERROR) 512: E_USER_WARNING. This is like a reminder message customized by the user using the PHP function trigger_error (an E_WARNING warning set by the programmer) 1024: E_USER_NOTICE. This is like a standardized warning by trigger_error using the PHP function (an E_NOTICE set for programmers) 2048: E_STRICT encoding. PHP is allowed to recommend how to modify the code to ensure the best interoperability forward compatibility. 4096: E_RECOVERABLE_ERROR indicates a fatal error. This is like an E_ERROR, but it can be captured through user-defined processing (see set_error_handler () 8191: all errors and warnings of E_ALL (excluding E_STRICT) (E_STRICT will be part of E_ALL as of PHP 6.0)

Any number of the above options can be connected with "OR" (OR |), so that all required levels of errors can be reported.
For example, the following code disables User-Defined errors and warnings, performs some operations, and then restores to the original error level:

<? Php // Disable Error Report error_reporting (0); // report error error_reporting (E_ERROR | E_WARNING | E_PARSE); // report all error error_reporting (E_ALL);?>