PHP：查找字符串中的最後一次出現

Question

我正在嘗試刪除字符串中的最後一個元音。例如：

$string = 'This is a string of words.'; 

$vowels = array('a','e','i','o','u'); 

if (in_array($string, $vowels)) { 

    // $newstring = '' // Drop last vowel. 

} 

echo $newstring; // Should echo 'This is a string of wrds.'; 

我該怎麼做？

感謝

Answer 1

使用正則表達式我們可以做到這一點：

$str = 'This is a string of words.'; 
echo preg_replace('/([aeiou]{1})([^aeiou]*)$/i', '$2', $str); 
//output: This is a string of wrds. 

解釋多一點的正則表達式：

• $ < - 這句話結束
• （[aeiou] {1}）< - 尋找一個元音
• （[^ aeiou]同時*）查找任何不是元音

Answer 2

希望這個作品

$string = 'This is a string of words.'; 

$words = explode(" ", $string); 

$lastword = array_pop($words); 

$vowels = array("a", "e", "i", "o", "u", "A", "E", "I", "O", "U", " "); 
$newlastword = str_replace($vowels, "", $lastword); 

$newstring=''; 
foreach ($words as $value) { 
    $newstring=$newstring.' '.$value; 
} 
$newstring=$newstring.' '.$newlastword; 
echo $newstring;