Priročnik PHP
NazajPoglavje 10. OperatorjiNaprej

Incrementing/Decrementing Operators

PHP supports C-style pre- and post-increment and decrement operators.

Tabela 10-5. Increment/decrement Operators

ExampleNameEffect
++$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:

<?php
echo "<h3>Postincrement</h3>";
$a = 5;
echo "Should be 5: " . $a++ . "<br />\n";
echo "Should be 6: " . $a . "<br />\n";

echo "<h3>Preincrement</h3>";
$a = 5;
echo "Should be 6: " . ++$a . "<br />\n";
echo "Should be 6: " . $a . "<br />\n";

echo "<h3>Postdecrement</h3>";
$a = 5;
echo "Should be 5: " . $a-- . "<br />\n";
echo "Should be 4: " . $a . "<br />\n";

echo "<h3>Predecrement</h3>";
$a = 5;
echo "Should be 4: " . --$a . "<br />\n";
echo "Should be 4: " . $a . "<br />\n";
?>

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Execution OperatorsGorLogical Operators