我试图从任意列中获取最小值,在列名中包含“xx”。
以下是我的代码:
<?php
$array = array(
array(
'id' => 1,
'10xx' => 14,
'11xx' => 32,
'12xx' => 4
),
array(
'id' => 2,
'10xx' => 13,
'11xx' => 36,
'12xx' => 41
)
);
foreach($array as $item)
{
$lowestKey = '';
foreach($item as $key => $value)
{
if(strpos($key, 'xx') === 0)
{
if($lowestKey == '')
{
$lowestKey = $key;
}
else
{
if($value < $item[$lowestKey])
{
$lowestKey = $key;
}
}
}
}
echo 'lowest for id ' . $item['id'] . ': ' . $item[$lowestKey] . "\n";
}
?>
答案 0 :(得分:2)
你已经有了一个功能:
http://php.net/manual/en/function.min.php
echo min(2, 3, 1, 6, 7); // 1
echo min(array(2, 4, 5)); // 2
echo min(0, 'hello'); // 0
echo min('hello', 0); // hello
echo min('hello', -1); // -1
如果这更符合您的需求,请将它与array_values结合使用。
答案 1 :(得分:2)
function _getNumber($array) {
return $array['id'];
}
$numbers = array_map('_getNumber', $array);
OR
$numbers = array_map(function($array) {
return $array['id'];
}, $array);
echo $min = min($numbers);
echo $max = max($numbers);
答案 2 :(得分:0)
不要再使用min()函数再次循环。
$lowest_keys = array();
foreach($array as $item)
{
unset( $item[ 'id' ] );
$lowest_keys[] = min( $item );
}
答案 3 :(得分:0)
function find_lowest($array){
$new_array = array();
foreach($array as $key => $val ){
if(is_array($val)){
$new_array[$key] = find_lowest($val);
}else{
$new_array[$key] = $val ;
}
}
return min($new_array);
}
$array = array( array( 'id' => 1,
'10xx' => 14,
'11xx' => 32,
'12xx' => 4
),
array(
'id' => 2,
'10xx' => 13,
'11xx' => 36,
'12xx' => 41
)
);
echo find_lowest($array);
答案 4 :(得分:0)
$array = array(
array(
'id' => 14,
'10xx' => 14,
'11xx' => 32,
'12xx' => 4
),
array(
'id' => 2,
'10xx' => 13,
'11xx' => 36,
'12xx' => 41
)
);
$lowestKey = '';
foreach($array as $arra){
foreach ($arra as $key=>$value){
if ($key == 'id'){
if(($value < $lowestKey )||( $lowestKey== '')){
$lowestKey = $value;
}
}
}
}
echo $lowestKey;
答案 5 :(得分:0)
foreach()
循环或array_walk()
循环每一行/子数组。id
提取并显示array_shift()
(第一个元素)值。min()
,以确定最小值。无条件表达式。没有不必要的变量。干净,简洁,有效。
代码:(Demo)
$array = [
['id' => 1, '10xx' => 14, '11xx' => 32, '12xx' => 4],
['id' => 2, '10xx' => 13, '11xx' => 36, '12xx' => 41]
];
array_walk($array, function($row) {
echo array_shift($row) , " : " , min($row) , "\n";
});
输出:
1 : 4
2 : 13