1.格式化輸出
chop 是rtrim()的別名;
ltrim()
trim()
nl2br()將\n轉換成<br>
print,echo,printf(),sprintf():
echo()不是函數,print()是函數,有返回值,boolen,false,true;
printf()格式化輸出
--函數,把文字格式化以後輸出,直接調用系統調用進行IO的,他是非緩沖的。如:
$name="hunte";
$age=25;
printf("my name is %s, age %d", $name, $age);
sprintf()格式化字符串,然後賦給一個變量,但是不輸出,類似於c了
<?php
echo nl2br("foo isn't\n bar");
echo "foo isn't\n bar";
?>
--跟printf相似,但不打印,而是返回格式化後的文字,其他的與printf一樣。如:
char sql[256];
sprintf(sql,"select * from table where no = '%s'",bankno);
它的功能只是把""裡面的語句賦給了變量sql。
strtolower
strtoupper
ucwords
ucfirst
2.字符串的連接和分割
(1)array explode(string input ,string separator , int limit)
使用一個字符串分割另一個字符串
<?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; // *
?>
例子 2. limit 參數示例
<?php
$str = 'one|two|three|four';
// 正數的 limit
print_r(explode('|', $str, 2));
// 負數的 limit
print_r(explode('|', $str, -1));
?>
string strtok( string input ,string separator)
<?php
$string = "This is\tan example\nstring";
/* Use tab and newline as tokenizing characters as well */
$tok = strtok($string, " \n\t");
//拿著空格,\n,\t作為令牌分割字符串
while ($tok !== false) {
echo "Word=$tok<br />";
$tok = strtok(" \n\t");
}
?>
結果:
Word=This
Word=is
Word=an
Word=example
Word=string
(2.)字符串的截取
$test="Your customer service is excellent";
echo substr($test,1);////////our customer service is excellent
echo "<br>";
echo substr($test,-9);//////從末尾起長度是9excellent
echo "<br>";
echo substr($test,0,4);////從0位置開始長度是4Your
echo "<br>";
echo substr($test,5,-13);/從第四個開始到倒數第13個字符customer service
echo "<br>";
$test="Your customer service is excellent";
echo substr($test,1);
echo "<br>";
echo substr($test,-11);
echo "<br>";
echo substr($test,0,6);
echo "<br>";
echo substr($test,5,-13);
echo "<br>";
our customer service is excellent
s excellent
Your c
customer service
(3)join()字符串的鏈接
3.字符串的查找
(1)string strstr ( string haystack, string needle ) 別名:strchr,stristr和strstr類似不同在於不區分大小寫
strrchr()相反的,查找的是最後一次出現的字符串
第一次出現起的字符串
<?php
$email = '
[email protected]';
$domain = strstr($email, '@');
echo $domain; // prints @example.com
?>
$email = '
[email protected]';
$domain =strstr($email,'e');
$domain2 =strrchr($email,'e');//最後一次出現起的字符串
echo $domain;
echo "<br>";
echo $domain2;
[email protected] e.com
(2)查找位置
int strpos(string str,string needle,[int offset]) 沒有找到返回的是false
返回從offset開始在str中查找needle的位置
$eg:$t-'hello world';
echo strpos($t,'o',5);
//7 從第o開始,查找o這個變量的位置,結果為7
int strrpos()
5.替換
str_replace("%body%","blank","<body text='%body%'")
6 。大寫小問題
Strpos
查找字符串中第一次出現的字符串的位置
Strrpos
查找字符串中某字符,繼第一次之後的最先出現的位置。
strpos(stripos無大小寫)
strrpos(strripos無大小寫)
strstr
stristr(無大小寫)
str_replace
str_ireplace(無大小寫)