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php for 循环语句用法与for 使用方法

Jun 08, 2016 pm 05:27 PM
counter echo lt nbsp quot

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

在PHP中使用的是执行相同的代码集的次数。作者的基本语法如下:

for循环只是一个多一点的代码,同时循环添加到它。而所涉及的一个循环的共同任务是:

设置一些计数器变量的初始值。
请检查条件语句是正确的。
执行中的代码循环。
增量在每个迭代结束通过循环计数器。
for循环允许你定义一个简单的代码行这些步骤。它似乎有一种奇怪的形式,所以一定要密切注意语法用!

FOR (expression 1, expression 2, expression 3)
{
  [code to execute]
}


for ( initialize a counter; conditional statement; increment a counter){
 do this code;
}

看简单实例一

FOR ($i = 0; $i {
  print "value is now " . $i . "
";
}

输出值

value is now 0
value is now 1
value is now 2

在第一循环,$i=0,这意味着表达,($i

在第二循环,$ = 1,这意味着表达,($i

在第三迭代,$i= 2,这意味着表达,($i

在第四迭代,$i= 3,这意味着表达,($i

实例二

$brush_price = 5;

echo "

";
echo "";
echo "";
for ( $counter = 10; $counter  echo "";
}
echo "
QuantityPrice
";
 echo $counter;
 echo "
";
 echo $brush_price * $counter;
 echo "
";

输出值

Quantity Price
10 50
20 100
30 150
40 200
50 250
60 300
70 350
80 400
90 450
100 500

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