PHP String functions and usage analysis

Addslashes: String add Slash.
Bin2Hex: The binary turns into 16 carry.
Chop: Remove continuous blank.
CHR: Returns the character of the ordinal value.
Chunk_split: Splits the string into small segments.
Convert_cyr_string: Converts the ancient Slavic string into other strings.
Crypt: Encrypts the string with DES encoding.
Echo: Output string.
Explode: Cut the string.
Flush: Clear out the output buffer.
Get_meta_tags: Extracts all meta tags from documents.
Htmlspecialchars: Converts special characters into HTML format.
Htmlentities: Converts all characters into an HTML string.
Implode: Converts an array into a string.
Join: Converts an array into a string.
LTrim: Remove continuous blank.
MD5: Computes the string of MD5.
NL2BR: Convert newline characters to <br>.
ORD: Returns the ordinal value of a character.
PARSE_STR: Parse query string into variables.
Print: Output string.
printf: Output format string.
Quoted_printable_decode: Converts the QP encoded string into a 8-bit string.
Quotemeta: Add reference symbol.
Rawurldecode: Revert from URL private format string to normal string.
Rawurlencode: Encodes a string into a URL-specific format.
SetLocale: Configure geographic information.
Similar_text: Computes string similarity.
Soundex: Calculating the pronunciation value of a string
sprintf: Format the string.
STRCHR: Find the first character that appears.
strcmp: string comparison.
STRCSPN: Length of different strings.
Strip_tags: Get rid of HTML and PHP tags.
Stripslashes: Remove backslash characters.
Strlen: Gets the string length.
Strrpos: Looks for the last occurrence of a character in the string.
Strpos: Looks for a character in the string to appear first.
STRRCHR: Gets the string at which a character last appears.
Strrev: Reverses the string.
STRSPN: Find out the number of strings that fall into another string mask.
Strstr: Returns the string from the beginning of a string to the end of the character string.
Strtok: Cut the string.
Strtolower: The string is all converted to lowercase.
Strtoupper: The string is all capitalized.
Str_replace: String substitution.
STRTR: Converts certain characters.
SUBSTR: Take a partial string.
Trim: Truncate the trailing space of the string.
Ucfirst: Capitalize the first character of the string.
Ucwords: Capitalize the first letter of each word in the string.

Addslashes
return value: String
Function type: Data processing
Description: This function makes it possible for database queries (query) to run smoothly by using the string, quotation marks, and quotes that need to be processed by the database. The characters that will be changed include single quotes ('), double quotes ("), backslash backslash (), and null character NUL (the null byte).
Reference: Stripslashes () Htmlspecialchars () Quotemeta ()

Bin2Hex
return value: String
Function type: Data processing
Description: This function enables the binary string to be turned into a 16-digit string.
Usage examples
Add:
Josh@superfork.com (22-jun-1999) writes a function that converts 16 to binary.
?
function Hex2bin ($data) {
$len = strlen ($data);
for ($i =0; $i < $len; $i +=2) {
$newdata. = Pack ("C", Hexdec (substr ($string, $i, 2));
}
return $newdata;
}
?>

Chop
return value: String
Function type: Data processing
Description: This function clears the continuous white space of the string.
Usage examples
?
$trimmed = Chop ($line);
?>
Reference: Trim ()

Chr
return value: String
Function type: Data processing
Description: This function converts the ordinal of a character to an ASCII character. This function is in contrast with Ord ()