基础函数-字符串处理函数

黄振国

#AddcSlashes 字符串加入反斜线
#语法：string addcslashes(string str,string charlist);
#在对 0，r，n 和 t 应用 addcslashes() 时要小心。在 PHP 中，\0，\r，\n 和 \t 是预定义的转义序列
=======================================================
<?php
$str = "Hello, my name is John Adams.";
echo $str.'<br>';
echo addcslashes($str,'mJ').'<br>';
echo addcslashes($str,'J');
?>

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#addslashes() 函数在指定的预定义字符前添加反斜杠。
#语法：string addslashes(string str);
#单引号 (')、双引号 (")、反斜杠 (\)、NULL
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<?php
$str = "Who's John \Adams?";
echo $str . " This is not safe in a database query.<br />";
echo addslashes($str) . " This is safe in a database query.";
?>

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#bin2hex 将二进位转成十六进位
#语法：string bin2hex(string str);
=======================================================
<?php
$str = "Hello world!";
echo bin2hex("$str").'<br>';
echo pack("H*",bin2hex($str));
?>

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#chop() 函数从字符串的末端开始删除空白字符或其他预定义字符。,同rtrim()
#语法:string chop(string str);
=======================================================
<?php
$str = "Hello World!\n\n";
echo $str;
echo chop($str);
?>

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#Chr Chr根据ASCII值返回字符
#语法：string chr(int ascii);
=======================================================
<?php
echo chr(52);
echo chr(052);
echo chr(0x52);
?>

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#chunk_split 将字符串分成小段
#语法：string chunk_split(string string,int [chunklen],string [end]);
=======================================================
<?php
$str = "Hello world!";
echo chunk_split($str,6,"...");
?>

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#count_chars() 函数返回字符串所用字符的信息。
#语法：mixed count_chars(string string,[mode]);
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<?php
$str = "Hello World!";
print_r(count_chars($str,1));
?>

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#crypt 返回字符串用DES编码加密
#语法：string crypt(string str,string [salt]);
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<?php
if (CRYPT_STD_DES == 1)
{
echo "Standard DES: ".crypt("hello world")."\n<br />";
}
else
{
echo "Standard DES not supported.\n<br />";
}

if (CRYPT_EXT_DES == 1)
{
echo "Extended DES: ".crypt("hello world")."\n<br />";
}
else
{
echo "Extended DES not supported.\n<br />";
}

if (CRYPT_MD5 == 1)
{
echo "MD5: ".crypt("hello world")."\n<br />";
}
else
{
echo "MD5 not supported.\n<br />";
}

if (CRYPT_BLOWFISH == 1)
{
echo "Blowfish: ".crypt("hello world");
}
else
{
echo "Blowfish DES not supported.";
}
?>

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#echo 显示内容
#语法：echo(string arg1,string [argn].....);
=======================================================
<?php
echo 'This ','string ','was ','made ','with multiple parameters';
?>

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#explode() 函数把字符串分割为数组。
语法：explode(separator,string,limit)
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<?php
$str = "Hello world. It's a beautiful day.";
print_r (explode(" ",$str));
?>