php中几个字符处理函数的说明
函数
字符串分割与连接函数:
代码: |
array explode(string delimiter, string data) |
使用字符串 dellimiter 把 data 分割成一个数组返回
类似函数:split()
代码: |
string implode(array data, string dellimiter) |
作用和explode()正好相反,把数组用dellimiter连接成一个长字符串
函数别名:join()
代码: |
array split(string pattern, string text[, integer limit]) |
使用匹配模式pattern的字符作为分隔符,把字符串text分割成数组
limit 可选参数,限制分割的段数
字符串编解码函数:
代码: |
string addslashes(string text) |
在字符串text中的特殊字符之前加“\”返回,特殊字符包括 ('), ("), (\)。
类似函数:quotemeta()
代码: |
string stripslashes(string text) |
和addslashes()函数正好相反,去掉反斜杠编码
代码: |
string quotemeta(string text) |
类似于addslashes(),区别在于它的特殊字符包括: . \ + * ? [ ] ^ ( ) $
代码: |
string escapeshellcmd(string command) |
在所有有可能在shell命令中引起麻烦的字符前加反斜杠。
用于exec(), system()等函数之前。
代码: |
string mysql_escape_string(string text) |
把一个SQL字符串转义,以安全用于mysql_query()
HTML 相关函数
代码: |
string htmlentities(string text) |
转换所有HTML实体
代码: |
string htmlspecialchars ( string string [, int quote_style [, string charset]]) |
转换特定字符为HTML实体
quote_style: (ENT_COMPAT|ENT_QUOTES)
quote_style默认值:ENT_COMPAT 转换&
当quote_style为:ENT_QUOTES时,除转换以上字符外还转换 " and '
代码: |
string trim(string text) |
去掉字符串text开始和结束处的空字符
代码: |
string ltrim(string text) |
去掉字符串text开始处的空字符
代码: |
string rtrim(string text) |
去掉字符串text结束处的空字符
代码: |
string chop(string text) |
函数rtrim()的别名

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