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PHP编程:第4版
book

PHP编程:第4版

by Kevin Tatroe, Peter MacIntyre
January 2021
Intermediate to advanced
505 pages
9h 45m
Chinese
Publishing House of Electronics Industry
Content preview from PHP编程:第4版
140
5
数组
使用
for
循环
如果知道要处理的是一个索引数组,且它的键为从
0
开始的连续整数,那么可以使用
for
循环来遍历索引。
for
循环在数组本身操作,而不是在数组的副本中操作,按照键的
顺序来处理元素,而不考虑它们的内部顺序。
下面显示的是如何使用
for
循环来打印一个数组
$addresses = array("spam@cyberpromo.net", "abuse@example.com");
$addressCount = count($addresses);
for ($i = 0; $i < $addressCount; $i++) {
$value = $addresses[$i];
echo "{$value}\n";
}
spam@cyberpromo.net
abuse@example.com
为数组中的每个元素调用函数
PHP
提供了一个函数
array_walk()
,用于为数组中的每个元素调用用户自定义的函数
array_walk(
array, callable
);
自定义的函数接受两个或三个参数 :第一个是元素的值,第二个是元素的键,第三个是
该函数被
array_walk()
调用时使用的值。例如,下面是把数组的值作为表格的列来打印
的另一种方法
$$printRow = function ($value, $key)
{
print("<tr><td>{$key}</td><td>{$value}</td></tr>\n");
};
$person = array('name' ...
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Publisher Resources

ISBN: 9787121404634