php最短/最长的字符串在数组中
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02-10-2019 - |
题
我有一个 大批 像这样
$data = array(
"163",
"630",
"43",
"924",
"4",
"54"
);
我如何选择 最小和最大的价值 从中 根据字符串长度 没有数字值。 (在此示例中,是1(最小)和3(最大).
解决方案
似乎您应该使用 array_map()
// Convert array to an array of string lengths
$lengths = array_map('strlen', $data);
// Show min and max string length
echo "The shortest is " . min($lengths) .
". The longest is " . max($lengths);
请注意 $lengths
数组是未分类的,因此您可以轻松地检索每个字符串长度的相应数字。
其他提示
这是改进的版本 brian_d的代码:
$min = PHP_INT_MAX;
$max = -1;
foreach ($data as $a) {
$length = strlen($a);
$max = max($max, $length);
$min = min($min, $length);
}
尽管在这种情况下,不建议这样做,因为您将两次穿越数组,但您也可以使用 array_reduce 将每个元素与其他元素进行比较。像这样:
<?php
$data = array('163','630','43','42','999','31');
//Will return the longest element that is nearest to the end of the array (999)
//That's why we use strlen() on the result.
$max_l = strlen(array_reduce($data,'maxlen'));
//Will return the shortest element that is nearest to the end of the array (31)
$min_l = strlen(array_reduce($data,'minlen'));
echo "The longest word is $max_l characters, while the shortest is $min_l\n";
function maxlen($k,$v) {
if (strlen($k) > strlen($v)) return $k;
return $v;
}
function minlen($k,$v) {
if ($k == '') return PHP_INT_MAX;
if (strlen($k) < strlen($v)) return $k;
return $v;
}
?>
如果您使用的是PHP 5.3.0+,则可以利用 关闭:
<?php
$max_l = strlen(array_reduce($data,
function ($k,$v) { return (strlen($k) > strlen($v)) ? $k : $v; }
));
$min_l = strlen(array_reduce($data,
function ($k,$v) {
if (!$k) return PHP_INT_MAX;
return (strlen($k) < strlen($v)) ? $k : $v;
}
));
echo "The longest word is $max_l characters, while the shortest is $min_l\n";
?>
$min = 100;
$max = -1;
foreach($data as $a){
$length = strlen($a);
if($length > $max){ $max = $length; }
else if($length < $min){ $min = $length; }
}
<?php
$array = array(
"163",
"630",
"43",
"924",
"4",
"54"
);
$arraycopy = array_map('strlen',$array);
asort($arraycopy);
$min = reset($arraycopy);
//if you need a single 'minword'
$minword = $array[key($arraycopy)];
//if you need them all
$minwords = array_intersect_key($array,array_flip(array_keys($arraycopy,$min)));
$max = end($arraycopy);
//if you need a single 'maxword'
$maxword = $array[key($arraycopy)];
//if you need them all:
$maxwords = array_intersect_key($array,array_flip(array_keys($arraycopy,$max)));
var_dump($min,$max,$minword,$maxword,$minwords,$maxwords);
为了完成,这里是最大和最小值的单线:
$maximum = max(array_map('strlen', $array));
$minimum = min(array_map('strlen', $array));
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