這個例子解釋了關於POSTFIX和PREFIX的一切。
Operator Name Description
++$x Pre-increment Increments $x by one, then returns $x
$x++ Post-increment Returns $x, then increments $x by one
--$x Pre-decrement Decrements $x by one, then returns $x
$x-- Post-decrement Returns $x, then decrements $x by one
實施例: -
<?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";
?>
檢查此link爲更詳細地: -
算被用來對變量和值執行操作。
PHP劃分運營商在以下組:
-Arithmetic運營
-Assignment運營
-comparison運營
-Increment /遞減運營
- 邏輯運算符
個
-STRING運營商
- 陣列運營商
檢查這個link爲PHP運營商
'++ i' $預和'$ I ++'爲崗位,所以是的,你是正確的 – aron9forever
儘管我覺得有必要指出PHP從來沒有真正被編譯過***,但它被***解釋爲***,就像python或java字節碼 – aron9forever
[PHP文檔參考](http://www.php .net/manual/en/language.operators.increment.php)....如果有疑問,請閱讀PHP文檔 –