PHP supports C-style pre- and post-increment and
decrement operators.
表格 11-5. Increment/decrement Operators
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"; ? |