/**
 * 统计字符串单词数量
 *
 * @param 
 * @arrange (512.笔记) jb51.cc
 **/ 
function word_count($sentence){ 
    $array = explode(" ",$sentence); 
    return count($array); 
} 
$words = word_count("The is a group of words"); 
echo $words; 


/***   来自编程之家 jb51.cc（jb51.cc）   ***/