str_replace 字符串匹配替换 explode 拆分字符串成数组 implode 数组 为字符串 list($month, $day, $year) = split ('[/.-]', $date);

str_replace 字符串匹配替换     

$keyword="asp php,jsp";
$keyword=str_replace("  "," ",$keyword);  
echo $keyword;
echo "<br>";
$keyword=str_replace(" ",",",$keyword);
echo $keyword;
echo "<br>";
$keyarr=explode(',',$keyword); 
for($index=0;$index<count($keyarr);$index++) 
{ 
  $whereSql .= " And (arc.title like '%$keyarr[$index]%' Or arc.keywords like '%$keyarr[$index]%') ";
} 
echo $whereSql;

       explode  拆分字符串成数组    

<?php 
// 示例 1 
$pizza = "piece1 piece2 piece3 piece4 piece5 piece6"; 
$pieces = explode(" ", $pizza); 
echo $pieces[0]; // piece1 
echo $pieces[1]; // piece2 
// 示例 2 
$data = "foo:*:1023:1000::/home/foo:/bin/sh"; 
list($user, $pass, $uid, $gid, $gecos, $home, $shell) = explode(":", $data); 
echo $user; // foo 
echo $pass; // * 
?> 

<?php 
$date = "04/30/1973"; 
list($month, $day, $year) = split ('[/.-]', $date); 
echo "Month: $month; Day: $day; Year: $year<br />
"; 
?>