部分读取阵列
部分读取阵列
提问于 2015-01-31 06:05:32
我需要在循环中部分读取数组，这就是我要做的：
$list = range(1, 9);
shuffle($list);
print_r($list);
for ($i=0; $i<=9; $i++) {
if ($i % 3 == 0) {
echo "=============== START =============== \n";
foreach (array_splice($list, $i) as $value) {
echo $value. "\n";
}
echo "=============== END =============== \n";
}
}输出：
Array
(
[0] => 4
[1] => 6
[2] => 8
[3] => 3
[4] => 7
[5] => 1
[6] => 9
[7] => 2
[8] => 5
)
=============== START ===============
4
6
8
3
7
1
9
2
5
=============== END ===============
=============== START ===============
=============== END ===============
=============== START ===============
=============== END ===============
=============== START ===============
=============== END =============== ..。所以它只打印了一次数组。但我希望数组在每次迭代中都会打印0-3, 3-6, 6-9。
预期产出：
=============== START ===============
4
6
8
=============== END ===============
=============== START ===============
3
7
1
=============== END ===============
=============== START ===============
9
2
5
=============== END =============== 回答 5
Stack Overflow用户
回答已采纳
发布于 2015-01-31 06:17:20
改变array_splice($list, $i) as $value
致：array_slice($list, $i, 3) as $value
接合：删除数组的一部分并用其他东西替换它
切片：提取数组的一个片段
Stack Overflow用户
发布于 2015-01-31 06:27:10
<?php
$list = range(1, 9);
shuffle($list);
print_r($list);
$chunks = array_chunk($list,3);
foreach($chunks as $chunk){
echo "=============== START =============== \n";
foreach($chunk as $value){
echo $value;
}
echo "=============== END =============== \n";
}
?>Stack Overflow用户
发布于 2015-01-31 06:27:38
array_chunk是一种选择。将数组分割为3块，然后是foreach循环。
$list = range(1, 9);
shuffle($list);
$chunks = array_chunk($list, 3);
foreach ($chunks as $chunk) {
echo "=============== START =============== <br/>\n";
foreach ($chunk as $value) {
echo $value . "<br/>\n";
}
echo "=============== END ===============<br/> \n";
}http://php.net/manual/en/function.array-chunk.php
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/28248740
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