PHP special characters such as backslash handling functions addslashes () and stripslashes () use

Source: Internet
Author: User
PHP's own library functions Addslashes () and Stripslashes () are string-processing class functions that are the opposite:

Addslashes (): Adds a backslash to some of the predefined characters in the input string, which is required for database query statements, and so on. These predefined characters are: Single quotation mark ('), double quotation mark ("), backslash (\), NULL.

Stripslashes (): Removes the backslash added by the addslashes () function. This function cleans up data retrieved from a database or HTML form. (if two consecutive backslashes, remove one, keep one; if there is only one backslash, remove it directly.) )

PS: By default, PHP instruction MAGIC_QUOTES_GPC is on, and automatically runs Addslashes () for all GET, POST, and COOKIE data. Do not use Addslashes () for strings that have been MAGIC_QUOTES_GPC escaped, because this results in double-layer escaping. You can use the function GET_MAGIC_QUOTES_GPC () to detect this situation. Cases:

if (GET_MAGIC_QUOTES_GPC ()) {      code ...}

Addslashes () Example:

  "; Echo addslashes ($STR)." This is safe in a database query. ";? >


Who ' s John Adams? This is the not safe in a database query.
Who\ ' s John Adams? This is safe in a database query.

Stripslashes () Example:



Who ' s John Adams?

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