PHP String Variables

PHP String Variables

A string variable is used to store and manipulate text.

String Variables in PHP

String variables are used for values that contains characters.

In  this  chapter  we  are  going  to  look  at  the  most  common  functions  and operators used to manipulate strings in PHP.

After  we create a string  we can manipulate  it. A  string can be  used directly in a function or it can be stored in a variable.


 Below,  the  PHP  script  assigns  the  text  “Hello  World”  to  a  string  variable called $txt:

<?php

$txt=”Hello World”;

echo $txt;

?>

The output of the code above will be:

Hello World

Now,  lets  try  to  use  some  different  functions  and  operators  to  manipulate the string.

The Concatenation Operator

There is only one string operator in PHP.

The concatenation operator (.)  is used to put two string values together. To  concatenate  two  string  variables  together,  use  the  concatenation operator:

<?php

$txt1=”Hello World!”;

$txt2=”What a nice day!”;

echo $txt1 . ” ” . $txt2;

?>

The output of the code above will be:

Hello World! What a nice day!

If  we  look  at  the  code  above  you  see  that  we  used  the  concatenation operator  two  times. This is because  we had to insert a third string  (a space character), to separate the two strings.



The strlen() function

The strlen() function is used to return the length of a string.

Let’s find the length of a string:

<?php

echo strlen(“Hello world!”);

?>

The output of the code above will be: 12

The  length  of  a  string  is  often  used  in  loops  or  other  functions,  when  it  is important  to  know  when  the  string  ends.  (i.e.  in a loop,  we  would  want  to stop the loop after the last character in the string).

The strpos() function

The strpos() function is used to search for character within a string. If a match is found, this function will return the position of the first match. If no match is found, it will return FALSE.

Let’s see if we can find the string “world” in our string:

<?php

echo strpos(“Hello world!”,”world”);

?>

The output of the code above will be: 6

The position of the string “world” in our string is position 6. The reason that it is 6 (and not 7), is that the first position in the string is 0, and not 1.

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