php数组算法有问题吗
我不擅长算法。这是我的麻烦 我有一个数组:php数组算法有问题吗,php,arrays,algorithm,Php,Arrays,Algorithm,我不擅长算法。这是我的麻烦 我有一个数组: $test_arr = array( 0 => 'a', 1 => 'b', 2 => 'c', 3 => 'd', 4 => 'e', 5 => 'f', 6 => 'g', 7 => 'h', 8 => 'i', ); 如何使用以下算法对其重新排序: $test_arr = array( 0 => array( 'a', 'b', ),
$test_arr = array(
0 => 'a',
1 => 'b',
2 => 'c',
3 => 'd',
4 => 'e',
5 => 'f',
6 => 'g',
7 => 'h',
8 => 'i',
);
如何使用以下算法对其重新排序:
$test_arr = array(
0 => array(
'a', 'b',
),
1 => array(
'c', 'd',
),
2 => array(
'e', 'f'
),
3 => array(
'g', 'h',
),
4 => array(
'i',
),
);
提前谢谢 以下是您正在寻找的算法:
$test_arr = array(
0 => 'a',
1 => 'b',
2 => 'c',
3 => 'd',
4 => 'e',
5 => 'f',
6 => 'g',
7 => 'h',
8 => 'i',
);
$tmp_array = [];
$new_array = [];
$i = 1;
foreach($test_arr as $k => $v){
if($i % 2 == 0){
$tmp_array[] = $v;
$new_array[] = $tmp_array;
$tmp_array = [];
}else{
$tmp_array[] = $v;
}
$i++;
}
if(count($tmp_array) > 0){
$new_array[] = $tmp_array;
}
echo '<pre>';
print_r($new_array);
$test\u arr=数组(
0=>a',
1=>“b”,
2=>c',
3=>d',
4=>“e”,
5=>f',
6=>g',
7=>“h”,
8=>“i”,
);
$tmp_数组=[];
$new_数组=[];
$i=1;
foreach($k=>v){
如果($i%2==0){
$tmp_数组[]=$v;
$new_array[]=$tmp_array;
$tmp_数组=[];
}否则{
$tmp_数组[]=$v;
}
$i++;
}
if(计数($tmp_数组)>0){
$new_array[]=$tmp_array;
}
回声';
打印(新阵列);
PHP已经有了一个内置函数来完成完全相同的任务。即array\u chunk()
试试这个:
<?php
$test_arr = array(
0 => 'a',
1 => 'b',
2 => 'c',
3 => 'd',
4 => 'e',
5 => 'f',
6 => 'g',
7 => 'h',
8 => 'i',
);
$newarray = array();
foreach( $test_arr as $key => $value){
if ( ($key == 0) || (($key % 2) == 0)){
if( isset($test_arr[($key + 1)]) ) { $next = $test_arr[($key + 1)]; } else { $next = ''; }
$newarray[] = array($value, $next);
}
}
echo print_r($newarray, true);
?>
此解决方案循环给定数组,仅当当前键为0或偶数时,才会将当前值和下一个值保存到新数组
Array
(
[0] => Array
(
[0] => a
[1] => b
)
[1] => Array
(
[0] => c
[1] => d
)
[2] => Array
(
[0] => e
[1] => f
)
[3] => Array
(
[0] => g
[1] => h
)
[4] => Array
(
[0] => i
[1] =>
)
)
Google:
PHP array\u chunk()
虽然这个代码片段可以解决这个问题,但它确实有助于提高文章的质量。请记住,您将在将来回答读者的问题,这些人可能不知道您的代码建议的原因。
Array
(
[0] => Array
(
[0] => a
[1] => b
)
[1] => Array
(
[0] => c
[1] => d
)
[2] => Array
(
[0] => e
[1] => f
)
[3] => Array
(
[0] => g
[1] => h
)
[4] => Array
(
[0] => i
[1] =>
)
)