Php 如何在多维数组中查找字符串长度最长的数组
嗨,伙计们! 我有这样一个多维数组: $arr = Array ( [0] => Array ( ['id'] => 1 ['title'] => one test ) [1] => Array ( ['id'] => 4 ['title'] => two test xyz ) [2] => Array ( ['id'] => 2 ['title'] => fdfdf dfdfdffdfdf ) [3] => Array ( ['id'] => 3 ['title'] => fddddđ fffffffff ssss ) ) array( 'id' => 4, 'title' => 'fddddđ fffffffff ssss' ) 我该怎么办? 请在回答之前仔细查看我的更新,谢谢Php 如何在多维数组中查找字符串长度最长的数组,php,multidimensional-array,Php,Multidimensional Array,嗨,伙计们! 我有这样一个多维数组: $arr = Array ( [0] => Array ( ['id'] => 1 ['title'] => one test ) [1] => Array ( ['id'] => 4 ['title'] => two test xyz ) [2] => Array
$max = '';
$maxlen = 0;
foreach ($arr as $elm) {
$len = strlen($elm['title']);
if ($len > $maxlen) {
$maxlen = $len;
$max = $elm['title'];
}
}
echo "The longest string is \"$max\" and it is $maxlen chars long.\n";
要回答更新的问题,请使用$arr[$idxMax]['id']
。如果希望数组包含字符串及其索引,只需将其分配给一个新变量:
$longestEntry = $arr[$idxMax];
要将最高ID与最长字符串组合,请使用:
$maxlen = 0;
$maxId = $arr[0]['id']; // assuming array has at least one element
$idxMax = null;
foreach($arr as $idx => $elem) {
if(strlen($elem['title']) > $maxlen)
$idxMax = $idx;
$maxId = max($elem['id'], $maxId);
}
$max = array(
'id' => $maxId,
'title' => $arr[$idxMax],
);
这是一个迭代多维数组并返回其找到的最长字符串数组的版本。改编自肖恩·布莱特的代码,使事情变得简单
$arr = array(
"0" => array(
'id' => 1,
'title' => "one test"
),
"1" => array(
'id' => 2,
'title' => "two test xyz"
),
"2" => array(
'id' => 3,
'title' => "fdfdf dfdfdffdfdf"
),
"3" => array(
'id' => 4,
'title' => "fddddđ fffffffff ssss"
)
);
function longest_string(&$arr, &$max='',&$maxlen=false){
foreach ($arr as $elm=>$val) {
$len = strlen($val);
if ($len > $maxlen) {
$maxlen = $len;
$max = $arr;
}
if( is_array($val) ){
longest_string($val, $max, $maxlen);
}
}
return $max;
}
echo var_dump(longest_string($arr1));
// array(2) { ["id"]=> int(4) ["title"]=> string(22) "fddddđ fffffffff ssss" }
请看。好的,非常感谢你们。嘿,伙计们,我更新了新问题,帮帮我,谢谢。在你们回答之前仔细看看新的更新,谢谢,这里也一样。干净简单!嘿,你,我更新了新问题,帮帮我,谢谢你,我更新了新问题,帮帮我,谢谢我真的建议你读一个PHP速成课程。您应该能够通过搜索或翻阅手册来回答您的问题,它们绝不是不同的问题。$longesentry=$arr[$idxMax];我希望他们都被分配到一个新的数组中好的,在你回答之前,谢谢,重点是什么?这是单个数组中两个不相关的值。但是无论如何,你会在另一个答案中找到你的答案。我更新了新问题,请帮助我,谢谢
$string="";
foreach($arr as $list)
{
$string=strlen(list['title'])>strlen($string)?ist['title']:$string;
}
echo $string;
echo strlen($string)
you can find largest string also string length try it
$arr = array(
"0" => array(
'id' => 1,
'title' => "one test"
),
"1" => array(
'id' => 2,
'title' => "two test xyz"
),
"2" => array(
'id' => 3,
'title' => "fdfdf dfdfdffdfdf"
),
"3" => array(
'id' => 4,
'title' => "fddddđ fffffffff ssss"
)
);
function longest_string(&$arr, &$max='',&$maxlen=false){
foreach ($arr as $elm=>$val) {
$len = strlen($val);
if ($len > $maxlen) {
$maxlen = $len;
$max = $arr;
}
if( is_array($val) ){
longest_string($val, $max, $maxlen);
}
}
return $max;
}
echo var_dump(longest_string($arr1));
// array(2) { ["id"]=> int(4) ["title"]=> string(22) "fddddđ fffffffff ssss" }