<?php $a = "a"; $b = "b"; echo $a . $b; // ab // concatenation of its right and left argumentsConcatenating assignment operator Unlike many other languages (+ in Java), PHP has a special operation that can be used to concatenate two strings together.
<?php $a = "a"; $b = "b"; echo $a .= $b; // ab // appends the argument on the right side to the argument on the left sideIt is important to remember that this is the only way. Using the addition operator (like in Java) will result in the two strings being first converted to numeric values, and then added together.
<?php $a = "a"; $b = "b"; echo $a += $b; // 0