String common functions, string functions

String common functions, string functions

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

Echo addcslashes ('foo [] ', 'a. Z ');
// Output: \ f \ o \ [\]
// Escape all characters of the string foo [] ascii code between A and z
// Note: A-z cannot be written as z-A ascii code, which must be small to large.
// Echo addcslashes ('foo ['.'] ', 'z .. ');
// Output: \ zoo ['\.']


// Remove the backslash from the string
Stripcslashes

$ STR = <EOF
\\\\
EOF;
Echo $ STR;
//
Echo stripcslashes ($ STR );
/Escape the four escape characters into one/


// Escape '"\ by obtaining 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 () {// detects php. Does the ini Enable Automatic escape of the get post cookie gpc get post cookie?Foreach ($ _ GET as & $ val ){$ Val = addslashes ($ val); // convert the get Array}}

// Remove the escape characters added by the string operated by addslashes based on the current value of magic_quotes_runtime
Stripaddslashes (string $ str) 

Magic_quotes_sybase = On
$ Str = "''";
Echo stripaddslashes ($ str );
Output'

Magic_quotes_sybase = Off
$ Str = "\'\"\\";
Echo stripaddslashes ($ str );
Output '"\

// The rtrim alias function deletes all characters in the specified character list on the right of the string. By default, the character list contains only spaces.
Chop (string $ str [, string $ charlist])

Var_dump (chop ('123 '));
Output string (4) 123

Var_dump ('2017 C', 'C ');
Output string (5) 123

Var_dump ('1970 asw', 'swa ');
Output string (5) 123


// Return the specified character of the ascii code
Chr (int $ ascii)

Echo chr (97 );
Output

// Use this function to split a string into small pieces. For example, convert the base64_encode () output to a string that complies with the RFC 2045 syntax. It willChunklen(76 by default) characters inserted afterEnd(\ R \ n by default "). 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 base64_encode () output to a string that complies with the RFC 2045 syntax.

// Returns the characters used by the string.
Count the number of occurrences of each byte value (0 .. 255) in String, and return results in multiple modes. The default value of mode is 0. Count_chars () returns the following results based on different modes:
0-an array with each byte value as the key name and number of occurrences as the value.
1-it is the same as 0, but only lists the byte values with occurrences greater than zero.
2-it is the same as 0, but only lists the byte values whose occurrences are equal to zero.
3-returns a string consisting of all byte values.
4-returns a string consisting of all unused byte values.
Count_chars (string $ str [, int $ mode])