Incrementing/Decrementing OperatorsPHP ManualPrevChapter 10. OperatorsNextIncrementing/Decrementing Operators PHP supports C-style pre- and post-increment and decrement operators. Table 10-4. Increment/decrement Operatorsexamplenameeffect++$aPre-incrementIncrements $a by one, then returns $a.$a++Post-incrementReturns $a, then increments $a by one.--$aPre-decrementDecrements $a by one, then returns $a.$a--Post-decrementReturns $a, then decrements $a by one. Here's a simple example script: 1  2 <?php 3 echo "<h3>Postincrement</h3>"; 4 $a = 5; 5 echo "Should be 5: " . $a++ . "<br>\n"; 6 echo "Should be 6: " . $a . "<br>\n"; 7  8 echo "<h3>Preincrement</h3>"; 9 $a = 5; 10 echo "Should be 6: " . ++$a . "<br>\n"; 11 echo "Should be 6: " . $a . "<br>\n"; 12  13 echo "<h3>Postdecrement</h3>"; 14 $a = 5; 15 echo "Should be 5: " . $a-- . "<br>\n"; 16 echo "Should be 4: " . $a . "<br>\n"; 17  18 echo "<h3>Predecrement</h3>"; 19 $a = 5; 20 echo "Should be 4: " . --$a . "<br>\n"; 21 echo "Should be 4: " . $a . "<br>\n"; 22 ?> 23  PrevHomeNextExecution OperatorsUpLogical Operators