php 常用字符串函数总结

<?php 
echo nl2br("foo isn't\n bar"); 
echo "foo isn't\n bar"; 
?> 

<?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 
$str = 'one|two|three|four'; 

// 正数的 limit 
print_r(explode('|', $str, 2)); 

// 负数的 limit 
print_r(explode('|', $str, -1)); 
?> 

<?php 
$string = "This is\tan example\nstring"; 
/* Use tab and newline as tokenizing characters as well */ 
$tok = strtok($string, " \n\t"); 

//拿着空格，\n,\t作为令牌分割字符串 

while ($tok !== false) { 
echo "Word=$tok<br />"; 
$tok = strtok(" \n\t"); 
} 
?> 

$test="Your customer service is excellent"; 
echo substr($test,1);////////our customer service is excellent 
echo "<br>"; 
echo substr($test,-9);//////从末尾起长度是9excellent 
echo "<br>"; 
echo substr($test,0,4);////从0位置开始长度是4Your 
echo "<br>"; 
echo substr($test,5,-13);/从第四个开始到倒数第13个字符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>"; 

<?php 
$email = 'user@example.com'; 
$domain = strstr($email, '@'); 
echo $domain; // prints @example.com 
?> 
$email = 'user@example.com'; 
$domain =strstr($email,'e'); 
$domain2 =strrchr($email,'e');//最后一次出现起的字符串 
echo $domain; 
echo "<br>"; 
echo $domain2;