Question

$string = "apple grapes apple banana otherwords more words apple grapes apple orange orange orange orange orange orange orange";

是否有任何PHP函数会返回哪个字符串（香蕉，苹果，葡萄）在给定字符串中出现次数最多？在此示例中，它应返回apple，但橙色的数字最多。

Answer 1

参见代码+解释。

<?php

$interesting = array('banana', 'apple', 'grapes');
$string = "apple grapes apple banana otherwords more words apple grapes apple orange";

// Explode into array
$array = explode(" ", $string);

// Group the values 
$count = array_count_values($array); 

// Sort the grouping by highest occurence to lowest
arsort($count);

// Get the keys of the most occurring
$keys = array_keys($count);

// compare key against the $interesting array for what you're interested in
$most_occurring = '';
foreach ($keys as $i) {
  if (in_array($i, $interesting, true)) {
      $most_occurring = $i;
      break;
  }
}

// Print output
echo "Most occurring $most_occurring, $count[$most_occurring] occurences.";

?>

Answer 2

虽然 rurouni88 的回答非常好，但它不再满足增加的要求，即并非所有单词都很重要，而是指定要查找的单词。你可以做到

<?php

   $string = "apple grapes apple banana otherwords more words apple grapes apple orange orange orange orange orange orange orange";
   $words=array("banana", "apple", "grapes");

   foreach($words as $word)
   {
     $counts[$word]=substr_count($string,$word);
   }
   arsort($counts);
   reset($counts);
   if($counts[0]>0)
     echo key($counts);     // apple
   else
     echo "Your words are not present";
?>

<强> Fiddle

Answer 3

你可以试试这个：

$string = "apple grapes apple banana otherwords more words apple grapes apple orange orange orange orange orange orange orange";
$array = explode(" ", $string);

$words = array_unique($array);
$counter = 0;
$returnWord = null;
foreach($words as $word){
   $currentWordCount = substr_count($string, $word);
   if($currentWordCount > $counter){
      $counter = $currentWordCount; 
      $returnWord = $word;
   }
}
echo "Most occurrences: ".$returnWord ." : ".$counter;

Most occurrences: orange : 7

编辑：

$string = "apple grapes apple banana otherwords more words apple grapes apple orange orange orange orange orange orange orange";

$words = array("banana", "apple", "grapes");
$counter = 0;
$returnWord = null;
foreach($words as $word){
   $currentWordCount = substr_count($string, $word);
   if($currentWordCount > $counter){
      $counter = $currentWordCount; 
      $returnWord = $word;
   }
}
echo "Most occurrences: ".$returnWord ." : ".$counter;

Most occurrences: apple : 4

Answer 4

是的，它被称为substr_count！

它接受字符串，事件的名称和要分析的子字符串。

例如，如果要检查该字符串中出现的最大次数，可以构建一个包含要检查的所有名称的数组，然后为每个值调用此函数。

示例源代码：

// initialize your string
$string = "apple grapes apple banana otherwords more words apple grapes apple orange";

// make an array with all the string names
$occurrences = explode(" ", $string);

// remove duplicate entries from the array
$occurrences = array_unique($occurrences);

// for every name, in an associative position, count the number of that occurrence in our string 
foreach ($occurrences as $occurrence) {
    $count[$occurrence] = substr_count($string, $occurrence);
}

// let see what it contains
var_dump($count);

// print out where it finds the max number of occorrences
echo "max occurrence found here: " . array_search(max($count), $count);

Answer 5

rurouni88的解决方案既优雅又优雅，但由于分类，它的开销很小。对于大数据，最好的方法是在O（nm）中编写ad-hoc函数：

function max_occurrences($array, $valid) {
    $count = array();
    $maxValue = 0;
    $maxEl = "";
    foreach( $array as $v ){
        if ( ! in_array($v, $valid, true) )
            continue;
        isset ( $count[$v] ) ? $count[$v]++ : $count[$v]=1  ;
        if ( $count[$v] > $maxValue ) {
            $maxValue = $count[$v];
            $maxEl = $v;
        }
    }
    return $maxEl;
}

$string = "apple grapes apple banana otherwords more words apple grapes apple orange orange orange orange orange orange orange";
echo max_occurrences(explode(" ",$string), array("apple","grapes", "banana"));

搜索出现次数最多的字符串

5 个答案: