PHP has its own filtering and escape functions

classification :

Function name	paraphrase	Introduce
htmlspecialchars	Will work with 、 Single and double quotation marks 、 Greater than and less than sign into HTML Format	& Turn into &amp;“ Turn into &quot;‘ Turn into &#039;< Turn into &lt;> Turn into &gt;
htmlentities()	All characters are converted to HTML Format	Except above htmlspecialchars Out of character , It also includes the display of double byte characters as encoding .
addslashes	Single and double quotation marks 、 Backslash and NULL Escape with backslash	The changed characters include single quotation marks (‘)、 Double quotes (“)、 Backslash backslash (\) And empty characters NULL.
stripslashes	Remove the backslash character	Remove the backslash character from the string . If there are two consecutive backslashes , Then remove one , Leave one . If there is only one backslash , Just get rid of it .
quotemeta	Add reference symbols	Include... In the string . \\ + * ? [ ^ ] ( $ ) Add a backslash in front of the characters such as “\” Symbol .
nl2br()	Convert newline characters to <br>
strip_tags	Get rid of HTML And PHP Mark	Remove any HTML Labelling and PHP Mark , Including the contents between marking and plugging . Note that if the string HTML And PHP There is an error in the label , It also returns an error .
mysql_real_escape_string	escape SQL Special characters in string	escape \x00 \n \r Space \ ‘ ” \x1a, It is very effective for multi byte character processing .mysql_real_escape_string Can judge the character set ,mysql_escape_string You don't have to consider .
base64_decode	base64 decode	To use MIME base64 Decode the encoded data
base64_encode	base64 code	Use MIME base64 Code the data
rawurldecode	URL decode	For encoded URL String decoding
rawurlencode	URL code	according to RFC 1738 Yes URL Encoding
urldecode	URL decode	Decode the encoded URL character string
urlencode	URL code	code URL character string

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