PHP escape characters

Source: Internet
Author: User
: This article mainly introduces PHP escape characters. if you are interested in the PHP Tutorial, refer to it. In many cases, escape errors may occur when you capture some text from a third party. Summarize some php built-in escape functions, as shown in

Function name




Convert the ampersand, single double quotation marks, greater than or less than sign into HTML format

& Convert &
> Convert to>

Htmlentities ()

Convert all characters to HTML format

In addition to the above htmlspecialchars characters, the two-byte characters are also displayed as encoding.


Double quotation marks, backslash, and NULL plus backslash escape

The modified characters include single quotation marks ('), double quotation marks ("), backslash (\), and NULL.


Remove backslash characters

Removes the backslash from the string. If there are two backslash lines in a row, remove one and leave one. If there is only one backslash, remove it directly.


Add a reference symbol

Include. \ + * in the string *? [^] ($) And other characters are preceded by the backslash "\" symbol.

Nl2br ()

Convert line breaks


Remove HTML and PHP tags

Remove any HTML and PHP tags in the string, including the contents between Mark blocking. Note: if the HTML and PHP tags of the string are incorrect, an error is returned.


Escape special characters in SQL strings

Escape \ x00 \ n \ r space \ '"\ x1a, which is very effective for processing multi-byte characters. Mysql_real_escape_string determines the character set, and mysql_escape_string does not need to be considered.


Base64 decoding

Decodes MIME base64 encoded data.


Base64 encoding

Use MIME base64 to encode data


URL decoding

Decodes the encoded URL string


URL encoding

Encode a URL string

'). AddClass ('pre-numbering '). hide (); $ (this ). addClass ('Has-numbering '). parent (). append ($ numbering); for (I = 1; I <= lines; I ++) {$ numbering. append ($ ('
  • '). Text (I) ;}; $ numbering. fadeIn (1700) ;}) ;}; script

    The above section introduces PHP escape characters, including some content, and hopes to help those who are interested in PHP tutorials.

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