php中常用字串的用法總結

echo implode(",", array('lastname', 'email', 'phone'));//陣列轉成字串

explode:

print_r(explode(",", 'lastname,email,phone'));//字串轉成陣列

split:

print_r(split("[/.-]","2008-9.12"));//以/或.或-任一符號切成數組

str_split:

print_r(str_split("Hello Friend",1));//將字串切開

preg_split:

//正規分割
//$ops = preg_split("{[+*/-]}","3+5*9/ 2");
//print_r($ops);//回傳：Array ( [0] => 3 [1] => 5 [2] => 9 [3] => 2 )

http_build_query:

//產生url-encoded 之後的請求字串
$data = array('localhost'=>'aa',
' user'=>'bb',
'password'=>'cc');
echo http_build_query($data);//回傳：localhost=aa&user=bb&password=cc

strtok:

//將字串切成小段
$string = "This istan examplenstring";
echo strtok($string,"nt" );//回傳：This is
echo '';
echo strtok("nt"); //當第二次回傳：an example
echo '';
echo strtok("nt"); //當第三次回傳：string

2，字串的尋找與替換 字串中很多是 r:取最後的，i:不區分大小寫的

echo $pos = strpos('abcdef abcdaef', 'a'); // 字母a第一次出現的位置,區分大小寫
echo $pos = strrpos('abcdef abcdeaf', 'a'); // 字母a最後一次出現的位置,區分大小寫

stripos:不區分大小寫 strripos:不區分大小寫

echo strstr('user@exa@mple.com', '@');//回傳：@exa@mple.com

stristr：不區分大小寫

echo strchr('user@exa@mple.com', '@');//回傳：@exa@mple.com

strrchr:則回傳：@mple.com，

preg_grep:

//傳回與模式相符的陣列單元
$food = preg_grep("/^p/",array("apple","orange ","pip","banana"));
print_r($food); //回傳：Array ( [2] => pip )

strtr:

//以指定的陣列替換找到的字串
$arr = array("www"=>"ftp","yahoo"= >"baidu");
echo strtr("www.yahoo.com",$arr);//返回：ftp.baidu.com
echo strtr("www.yahoo.com","wo" ,"sx");//回傳：sss.yahxx.cxm 翻譯字串把所有w換成了s把所有的o換成了x

strspn:

//找出比對到的最初部分的長度
echo strspn("abcdefg","1234567890");//strspn("abcdefg","1234567890");//strspn("abcdefg","1234567890");//strspn("abcdefg","1234567890");//strspn("abcdefg","1234567890");//strspn("abcdefg","1234567890");//strspn("abcdefg","1234567890");//strspn("abcdefg","1234567890");//strspn( 0
//找出沒有比對到的最初部份的長度
echo strcspn("abcdefg","1234567890");//回傳:7

3，字串的正規匹配 preg_match:

//回傳 pattern 所配對的次數。要么是 0 次（沒有匹配）或 1 次，因為 preg_match() 在第一次匹配之後將停止搜尋。
if (preg_match ("/php/i", "PhP is the web scripting language of choice."))
echo "存在";
else
echo "不存在";

preg_match_all:

//則相反，會一直搜尋到 subject 的結尾處。
preg_match_all("/(?(d{3})?)?(?(1)[-s])d{3}-d{4}/x",
"Call 555-1212 或1-800-555-1212", $phones);
print_r($phones[0]);//取得所有的電話號碼

ereg_replace:

//URL 替換為超連接
echo ereg_replace("[[:alpha:]]+://[^[:space :]]+[[:alnum:]/]",
"\0", '這是百度http://www.baidu.com網址。 ');
preg_replace:過濾
$search = array ("'<script>]*?>.*?</script>'si", // 去掉javascript
"']*?>'si", // 去掉HTML 標記
"'([rn])[s]+'", // 去掉空白字元
"'& (quot|#34);'i", // 替換HTML 實體
"'&(amp|#38);'i",
"'&(lt|#60);'i",
"'&(gt|#62);'i",
"'&(nbsp|#160);'i",
"'&(iexcl|#161);'i" ,
"'&(cent|#162);'i",
"'&(pound|#163);'i",
"'&(copy|#169);'i ",
"'(d+);'e"); // 作為PHP 程式碼運行
$replace = array ("",
"",
"\1",
""",
"&",
"">",
" ",
chr(161),
chr(162),
chr(163),
chr(169),
"chr(\1)");
echo $text = preg_replace ($search, $replace, 'test<script>alert("adfasdf");</script>');

preg_quote:

//轉義正規表示式字元,把每個要加都加上，符合正規式。
echo preg_quote('$40 for a g3/400','/');//回傳：$40 for a g3/400

sql_regcase:

//產生用於不區分大小的匹配的正則表達式
echo sql_regcase("Foo-bar.a"); //返回：[Ff][Oo][Oo]-[Bb][Aa][Rr].[Aa]

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