Empty string exception hint string common function

Specify character list characters to escape all characters contained in the list
Addcslashes (String $str, string $charlist);

Output: \f\o\o\[\]
Escapes all characters of the string foo[] ASCII code between a-Z
Note: A-Z cannot be written z-a ASCII code must be small to large
echo addcslashes (' foo[') ', ' Z '. A ');
Output: \zoo[' \. ']
To remove backslashes from a string
Stripcslashes
$STR = <<
 <>
\\\\
EOF;
Echo $STR;
//
echo stripcslashes ($STR);
/four escape character escapes to 1/

Escape by getting the value of php.ini magic_quotes_sybase
Addslashes (String $str)
Magic_quotes_sybase = Off
$str = ' \ ' "\ ';
echo addslashes ($STR);

Magic_quotes_sybase = On
$str = ' \ ' "\ ';
echo addslashes ($STR);
"'" \test.php?name= ' Liukai 'if (!GET_MAGIC_QUOTES_GPC ()) {//detect PHP. INI is turned on the Get post cookie automatically escapes the GPC get post Cookie's indent ($_get as & $val) {  $val = addslashes ( $val); Automatically go to the Get array }}

  
 //Remove the escape character added by the addslashes-manipulated string based on the value of the current Magic_quotes_runtime 
 Stripaddslashes (String $str) 
 Magic_quotes_sybase = on 
 $str = ""; 
 echo stripaddslashes ($STR); 
 Output ' 
 Magic_quotes_sybase = Off 
 $str = ' \ ' \ ' \ \ '; 
 echo stripaddslashes ($STR); The alias function for the 
 output ' \  
 //rtrim removes all characters in the specified list of characters to the right of the character list by default, only spaces 
 Chop (String $str [, String $charlist]) 
 Var_ Dump (Chop (' 123 ')); 
 Output String (4) 123 
 Var_dump (' 123 c ', ' C '); 
 Output string (5) 123 
 Var_dump (' 123 ASW ', ' swa '); 
 Output string (5) 123 
  
  
//Returns the specified character of the ASCII code 
 chr (int $ascii) 
 Echo chr; 
 Output a  
      
      //Use this function to split a string into small chunks is useful. For example, convert the output of Base64_encode () to a string that conforms to RFC 2045 semantics. It inserts  end  (the default is "\ r \ n") behind every  Chunklen  (default 76) character. This function returns a new string without modifying the original string. 
 Chunk_split (String $body, [,   int  $chunklen  [,   string  $end ]])  

$new _string = Chunk_split (Base64_encode ($data));  Converts the output of Base64_encode () to a string that conforms to RFC 2045 semantics.
Returns information about the characters used in the string
Counts the number of occurrences of each byte value (0..255) in a string and returns the result using multiple modes. Optional parameter mode The default value is 0. The following different results are returned according to the different Mode,count_chars ():
0-An array of values as the number of occurrences of each byte value as the key name.
1-Same as 0, but only byte values with occurrences greater than 0 are listed.
2-Same as 0, but only byte values with occurrences equal to zero are listed.
3-Returns a string consisting of all used byte values.
4-Returns a string consisting of all unused byte values.
Count_chars (String $str [, int $mode])

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