PHP - Operator String Operators

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Introduction

There's really only one string operator, and that's the concatenation operator . (dot).

This operator takes two string values, and joins the right-hand string onto the left-hand one to make a longer string.

For example:

Demo

<?php

echo "a, " . "b";   // Displays  "a, b"
?>/*from   w ww  .j  a  v  a2 s. c  o m*/

Result

You can concatenate more than two strings at once.

The values you concatenate don't have to be strings.

Due to PHP's automatic type conversion, non-string values, such as integers and floats, are converted to strings at the time they're concatenated: 

 Code:
 <?php
                                                                             
 $tempF = 1;
                                                                             
 echo "this is " . ( (5/9) * ($tempF-32) ) . " degrees C.";
 ?>

Result

You can use the combined assignment operator .= to join a new string onto the end of an existing string variable.

For example, the following two lines of code both do the same thing.

They change the string variable $x by adding the string variable $y to the end of it: 

$x = $x . $y;
$x .= $y;