Work with Strings in PHP

Mike Steward
May 19, 2012
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Article

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;
?> <hr>
<?php
echo "String Length(): length of DEEPAK DWIJ is -->";
echo strlen("DEEPAK DWIJ");
?> <hr>
<?php
echo "String Position() : Position of dwij in Deepak dwij is -->";
echo strpos("Deepak dwij","dwij");
?> <hr>
<?php
echo "Replace() : Deep is replaced by Deepak dwij -->";
$myString = "My name is Deep";
echo str_replace("Deep", "Deepak dwij", $myString);
?> <hr>
<?php
echo "String Toupper() : deepak is change to DEEPAK --> ";
$myString = "deepak";
echo strtoupper($myString);
?> <hr>
<?php
echo "UCfirst() : deepak is change to Deepak --> ";
$myString = "deepak";
echo ucfirst($myString);
?> <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:

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