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                ## *while* (PHP 4, PHP 5, PHP 7) *while* 循環是 PHP 中最簡單的循環類型。它和 C 語言中的 *while* 表現地一樣。*while* 語句的基本格式是: ~~~ while (expr) statement ~~~ *while* 語句的含意很簡單,它告訴 PHP 只要 *while* 表達式的值為 **`TRUE**` 就重復執行嵌套中的循環語句。表達式的值在每次開始循環時檢查,所以即使這個值在循環語句中改變了,語句也不會停止執行,直到本次循環結束。有時候如果 *while* 表達式的值一開始就是 **`FALSE**`,則循環語句一次都不會執行。 和 *if* 語句一樣,可以在 *while* 循環中用花括號括起一個語句組,或者用替代語法: ~~~ while (expr): statement ... endwhile; ~~~ 下面兩個例子完全一樣,都顯示數字 1 到 10: ``` <?php /*?example?1?*/ $i?=?1; while?($i?<=?10)?{ ????echo?$i++;??/*?the?printed?value?would?be ????????????????????$i?before?the?increment ????????????????????(post-increment)?*/ } /*?example?2?*/ $i?=?1; while?($i?<=?10): ????print?$i; ????$i++; endwhile; ?> ```
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