PHP is a Hypertext-preprocessor. A string can be used directly in a
function or it can be stored in a variable. Here in this articles we will use the XAMPP sever to run the php scripting.
Strings in PHP
With a string variable we can store and manipulate text. String variable are
used to contain the characters.
Let us see the various kind of functionality available with strings
in PHP.
- String variable
- String Length
- String Position
- String Replace
- String Toupper
- String ucfirst
- String Trim
Program
This is the php scripting to understand the functionality.
<html>
<head></head>
<body
bgcolor="#ffffCC">
<h3>
PHP STRINGS
</h3>
<hr/>
<?php
echo
" String
variable myString : ";
$myString =
"Text of a
String variable !";
echo
$myString;
?>
<br><br><hr>
<?php
echo
"String
Length(): length of DEEPAK DWIJ is -->";
echo
strlen("DEEPAK
DWIJ");
?>
<br><br><hr>
<?php
echo
"String
Position() : Position of dwij in Deepak dwij is -->";
echo
strpos("Deepak
dwij","dwij");
?>
<br><br><hr>
<?php
echo
"Replace()
: Deep is replaced by Deepak dwij -->";
$myString =
"My name
is Deep";
echo
str_replace("Deep",
"Deepak dwij",
$myString);
?>
<br><br><hr>
<?php
echo
"String
Toupper() : deepak is change to DEEPAK --> ";
$myString =
"deepak";
echo
strtoupper($myString);
?><br><br><hr>
<?php
echo
"UCfirst()
: deepak is change to Deepak --> ";
$myString =
"deepak";
echo
ucfirst($myString);
?>
<br><br><hr>
<?php
echo"StringTrim()
: ";
$myString =
" Deepak!
";
echo
trim($myString);
?>
</body>
</html>
Saved it by
string.php.
Result of string.php scripting
The above script
look like as under when it runs on browser:
![p1.gif]()
Various String functions
The string functions allow you to manipulate strings and you can add
functionality according to your requirement. Here you can find some of important
predefined functions, here they are:
| Function | Description |
| addcslashes() | Returns a string with backslashes in front of the specified characters |
| addslashes() | Returns a string with backslashes in front of predefined characters |
| chop() | Alias of rtrim() |
| chr() | Returns a character from a specified ASCII value |
| crypt() | One-way string encryption (hashing) |
| explode() | Breaks a string into an array |
| fprintf() | Writes a formatted string to a specified output stream |
| strcoll() | Locale based string comparison |
strcspn()
| Returns the number of characters found in a string before any part of some specified characters are found |
| str_word_count() | Count the number of words in a string |
| str_split() | Splits a string into an array |
Note : many more inbuilt-functions are available.
PHP string constant
Now you can find some the predefined constants.
|
Constant |
Description |
|
CRYPT_SALT_LENGTH |
Contains
the length of the default encryption method for the system. For
standard DES encryption, the length is 2 |
|
CRYPT_STD_DES |
Set to 1
if the standard DES-based encryption with a 2 character salt is
supported, 0 otherwise |
|
CRYPT_EXT_DES |
Set to 1
if the extended DES-based encryption with a 9 character salt is
supported, 0 otherwise |
|
CRYPT_BLOWFISH |
Set to 1
if the Blowfish encryption with a 16 character salt starting with
$2$ or $2a$ is supported, 0 otherwise0 |
|
HTML_SPECIALCHARS |
|
|
CHAR_MAX |
|
|
STR_PAD_LEFT |
|
|
STR_PAD_RIGHT |
|
|
STR_PAD_BOTH |
|
|
LC_MESSAGES |
|
|
LC_TIME |
|
|
LC_NUMERIC |
|
|
CRYPT_MD5 |
Set to 1
if the MD5 encryption with a 12 character salt starting with $1$ is
supported, 0 otherwise |
Note : many more are also available.