PHP filter string function_PHP tutorial

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function addslashes_str($str){
$str=addslashes($str);
$str=str_replace($str,";",';');
return $str;
}
function stripslashes_str($str){
$str=stripslashes($str);
$str=str_replace($str,';',";");
return $str;
}
?>

chop(); //Remove spaces on the right side of the string
trim(); //Remove all spaces in the string
ltrim(); //Remove spaces on the left side of the string
htmlspecialchars(); //Convert '$','"','<','>' to corresponding html entities
htmlentities(); //Convert all html tags into corresponding html entities
array explode(string separator, string str); //Split string
string implode(string separator, array arr); //Connect string
strtoupper(); strtolower(); //Convert case
ucfirst(); //Only convert the first character to uppercase
ucwords(); //Convert the first letter of each word to uppercase
iconv()
PHP internal code conversion function, same as above
Because iconv() has a bug when converting gb2312, it needs to be handled like this
iconv( "utf-8", "gb2312//ignore" , $str)

mb_convert_encoding()
PHP internal code conversion function
Version (php 4 >= 4.0.6, php 5)
This function can convert various encodings to each other
mb_convert_encoding($str,"gb2312", "utf-8");

mysql tutorial_real_escape_string()
Definition: Function to escape special characters in strings used in sql statements.
Syntax: mysql_real_escape_string(string,connection)
Description: This function escapes special characters in a string and takes into account the current character set of the connection, so it is safe to use with mysql_query().
?>