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Home php教程 PHP源碼 php for循環(huán)數(shù)組

php for循環(huán)數(shù)組

Jun 08, 2016 pm 05:27 PM
array for foreach nbsp

expr1 為條件的初始值。expr2 為判斷的條件,通常都是用邏輯運算符號 (logical operators) 當判斷的條件。expr3 為執(zhí)行 statement 后要執(zhí)行的部份,用來改變條件,供下次的循環(huán)判斷

<script>ec(2);</script>

/*
for 語法

?代碼如下 復(fù)制代碼
for (expr1; expr2; expr3) {
? statement
}

?

下面看for實例教程

*/

?代碼如下 復(fù)制代碼
$for = array(1,2,3,4,5,6);
$forFor = array(
????array(1),
????array(2),
????array(3)
????);

????
//先來看看用for循環(huán)一組數(shù)據(jù)的實例

?代碼如下 復(fù)制代碼

$arrayLen = sizeof( $for );

for( $i = 0; $i {
?echo $for[$i],'
';
}


/*
結(jié)果
1
2
3
4
5
6
這是我們想要的結(jié)果

for 來處理二維數(shù)組

?代碼如下 復(fù)制代碼
*/
for( $j=0;$j {
?//echo ($forFor($j));
}

// 出現(xiàn)Fatal error: Function name must be a string in提示

//我們換一種用戶用foreach來實例

?代碼如下 復(fù)制代碼
foreach( $forFor as $v => $vv )
{
?print_r($vv);
}

/*
輸出
(
??? [0] => 1
)
Array
(
??? [0] => 2
)
Array
(
??? [0] => 3
)
正好是我們想要的數(shù)據(jù),

總結(jié)
每個語句都有自己用途,我們要看如何更合理的去使用適合你當前操作的函數(shù)來快速的完成你的工作。
從上面來看for適合一維數(shù)據(jù),并且單一的循環(huán),foreach可以操作一維數(shù)據(jù)二維數(shù)據(jù)等。

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