   #PHP Manual Operators Logical Operators Array Operators

             PHP Manual
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String Operators

   There are two string operators. The first is the concatenation
   operator ('.'), which returns the concatenation of its right and left
   arguments. The second is the concatenating assignment operator ('.='),
   which appends the argument on the right side to the argument on the
   left side. Please read Assignment Operators for more information.

   <?php
   $a = "Hello ";
   $b = $a . "World!"; // now $b contains "Hello World!"
   $a = "Hello ";
   $a .= "World!";     // now $a contains "Hello World!"
   ?>

   See also the manual sections on the String type and String functions.
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