php的字符串格式化

1.字符串的整理：chop(),itrim(),trim()

trim()函数用来整理用户输入数据，如下显示：

$name=trim($name);

$email=trim($email);

tirm()函数可以去除字符串开始位置和结束位置的空格，并将结果字符串返回。默认情况下去除换行符（n）回车符(r)水平(t)和垂直制表符(x0B) 字符串结束符号()和空格。

以下是来自于手册

Without the second parameter, rtrim() will strip these characters:

    * " " (ASCII 32 (0x20)), an ordinary space.
    * "t" (ASCII 9 (0x09)), a tab.
    * "n" (ASCII 10 (0x0A)), a new line (line feed).
    * "r" (ASCII 13 (0x0D)), a carriage return.
    * "" (ASCII 0 (0x00)), the NUL-byte.
    * "x0B" (ASCII 11 (0x0B)), a vertical tab

Example#1 Usage example of rtrim()
<?php

$text = "ttThese are a few words :) ...  ";
$binary = "x09Example stringx0A";
$hello  = "Hello World";
var_dump($text, $binary, $hello);

print "n";

$trimmed = rtrim($text);
var_dump($trimmed);

$trimmed = rtrim($text, " t.");
var_dump($trimmed);

$trimmed = rtrim($hello, "Hdle");
var_dump($trimmed);

// trim the ASCII control characters at the end of $binary
// (from 0 to 31 inclusive)
$clean = rtrim($binary, "x00..x1F");
var_dump($clean);

?>

上例将输出：

string(32) "        These are a few words :) ...  "
string(16) "    Example string
"
string(11) "Hello World"

string(30) "        These are a few words :) ..."
string(26) "        These are a few words :)"
string(9) "Hello Wor"
string(15) "    Example string"

函数explode() implode() join()

explode — 使用一个字符串分割另一个字符串

字符串的排序 strcmp() strcasecmp() strnatcmp()

在字符串中查找字符串 strstr() strchr() strrchr() stristr()

太多了，慢慢看手册