如何在PHP中输出具有四个或四个以上字母的数组中的元素，并说明它们出现的次数 - How to output elements in an array with four or more letters in PHP and state how many times they occur

How to output elements in an array with four or more letters in PHP and state how many times they occur

如何从数组中输出包含四个或四个以上字母的单词，并说明它们出现的次数？

$selection = array("house", "are", "better", "love", "dog",
    "love", "don't", "me", "like", "apples", "frank", "better", "you", 
    "like", "house", "better", "love", "cream");
$array2 = array();
foreach ($selection as $word) {
    if (strlen($word) >= 4) {
        $array2[] = $word;
        print_r(array_count_values($word));
    }
}
return $array2;
foreach ($array2 as $key => $value) {
    printf("The word '$key' appears $value times<br>'n");
}

您的代码中有几个问题。您应该使用单词作为数组键，并保持一个运行计数。

此外，您正在调用return，这将有效地停止脚本。

最后，使用更具描述性的变量名来帮助跟踪您正在做的事情。

<?php
$selection = array("house", "are", "better", "love", "dog",
                   "love", "don't", "me", "like", "apples", "frank", "better", "you", 
                   "like", "house", "better", "love", "cream");
$results = array();
foreach ($selection as $word) {
    if (strlen($word) >= 4) {
        if (array_key_exists($word, $results) == false)
            $results[$word] = 0;
        $results[$word]++;
    }
}
foreach ($results as $word=>$count) {
    print "The word '$word' appears $count times<br>'n";
}
?>

http://codepad.viper-7.com/pq89ic

文档&相关阅读

return-http://us1.php.net/return
阵列-http://us1.php.net/manual/en/language.types.array.php
7+1命名变量的技巧关于制作好软件-http://www.makinggoodsoftware.com/2009/05/04/71-tips-for-naming-variables/

这样做：

<?
$selection = array("house", "are", "better", "love", "dog",
    "love", "don't", "me", "like", "apples", "frank", "better", "you", 
    "like", "house", "better", "love", "cream");
$array2 = array();
foreach ($selection as $word) {
    if (strlen($word) >= 4) {
        if (isset($array2[$word])) $array2[$word]++;
            else $array2[$word] = 1;
    }
}
foreach ($array2 as $key => $value) {
    printf("The word '$key' appears $value times<br>'n");
}
?>

见工作代码