Skip to main content

String Manipulation Functions in PHP

In the previous post Properties of String in PHP, we were discussing about the different properties of strings in PHP. String manipulation as you know, is an important part of web programming. PHP being a web programming language thus provides good set of string manipulation functions. In this post we’re going to discuss some of those which arte frequently needed.

1. trim() function

Prototype: string trim (string str);

This function strips white spaces from the start and end of the string supplied returning the resulting string..

When we have to take user input via form, it’d be a good idea to “trim” the variables as extra white spaces sometimes creep in.

$name=trim($_GET['name'];

2. explode() function

Prototype: array explode (string separatorstring inputint limit);
The argument “limit” is optional.

This function splits the string “input” on a specified “separator” and returns the different split strings as an array. The optional parameter “limit” determines the maximum number of splitting you want.

$str="String Manipulation in PHP";
$arr=explode(" "$str);

Now $arr would be having the following values:

$arr[0]="String";
$arr[1]="Manipulation";
$arr[2]="in";
$arr[3]="PHP";

2. substr() function

Prototype: string substr (string strint startint length);
“length” is optional.

This function can help you take a sub string starting from the position “start” till the end (or the “length”, if specified) from the string “str”.


$str="She is here";
$s=substr($str1);
$s2=substr($str15);

$s will contain “he is here”.
$s2 will contain “he is”.

Note: Position of first character is 0.

4. strlen() function

Prototype: int strlen (string str);

It returns the length of the string “str”.

$str="PHP is Great";
$len=strlen($str);

$len = 12 here.

5. strcmp() function

Prototype: int strcmp (string str1string str2);

This function does a case-sensitive comparison of the two strings passed “str1” and “str2” and returns 0 if both are identical. It returns other negative and positive values in other cases depending on which string is greater in lexicographic order.

6. strpos() function

Prototype: int strpos (string haystackstring needleint offset);
“offset” is optional. “needle” is the string to be searched for in “haystack”.

It returns the position of the first occurrence of the string “needle” in “haystack” starting from the position “offset”, if specified.

$haystack="We are discussing string manipulation functions in PHP";
$needle="are";
$pos=strpos($haystack$needle);

$pos will contain 3.

Note: Position of first character is 0.

Related Articles:

Popular posts from this blog

Fix For Toshiba Satellite "RTC Battery is Low" Error (with Pictures)

RTC Battery is Low Error on a Toshiba Satellite laptop "RTC Battery is Low..." An error message flashing while you try to boot your laptop is enough to panic many people. But worry not! "RTC Battery" stands for Real-Time Clock battery which almost all laptops and PCs have on their motherboard to power the clock and sometimes to also keep the CMOS settings from getting erased while the system is switched off.  It is not uncommon for these batteries to last for years before requiring a replacement as the clock consumes very less power. And contrary to what some people tell you - they are not rechargeable or getting charged while your computer or laptop is running. In this article, we'll learn everything about RTC batteries and how to fix the error on your Toshiba Satellite laptop. What is an RTC Battery? RTC or CMOS batteries are small coin-shaped lithium batteries with a 3-volts output. Most laptops use

The Best Way(s) to Comment out PHP/HTML Code

PHP supports various styles of comments. Please check the following example: <?php // Single line comment code (); # Single line Comment code2 (); /* Multi Line comment code(); The code inside doesn't run */ // /* This doesn NOT start a multi-line comment block /* Multi line comment block The following line still ends the multi-line comment block //*/ The " # " comment style, though, is rarely used. Do note, in the example, that anything (even a multi-block comment /* ) after a " // " or " # " is a comment, and /* */ around any single-line comment overrides it. This information will come in handy when we learn about some neat tricks next. Comment out PHP Code Blocks Check the following code <?php //* Toggle line if ( 1 ) {      // } else {      // } //*/ //* Toggle line if ( 2 ) {      // } else {      // } //*/ Now see how easy it is to toggle a part of PHP code by just removing or adding a single " / " from th

Designing a Simple Order Form Application in PHP

Ok guys, for this post we’re going to create a simple yet complete order form page. Order forms are used on many sites to take customers order online. Order forms should have the capability to take orders from visitors regarding what items they want to purchase and store the information for further processing. For this post’s example, we are going to create an order form for a Book Seller. The form will be designed to take order of five different items (books). Our order form application should be able to take order of five different items in any separate quantities tht user wants, it should also ask for shipping address and name of the customer. It should then store the information provided in a file along with the date and time order was placed. The application should also be able to take any number of orders and store them all linearly for further human processing. For this, we need a front end of a HTML form to which the user would interact a