PHP中的字符串操作功能是比较多的,重要的有以下这些:

  (1)echo,print,printf,sprintf
  前两个函数是输出字符串.字符串中如果有变量名则被替换成其值. 后两个函数类似于C的同名函数.

  (2)strchr,strlen,strtok,strrchr,strrev,strstr,strtolower, strtoupper,substr,ucfirst
  这些是常用的字符串操作函数,有些和C中的同名函数意义完全一致.
  strrev是把一个字符串翻转.
  strtolower和strtoupper的意思应该不用解释了.
  ucfirst是把字符串的第一个字符变成大写.
  substr是返回字符串的一个子串,用法是:substr(字符串,头,长度).
  头位置是 从0算起的.如果是负数,则是从尾部向前数的意思.

  (3)Chr,Ord
  类似于C的同名函数.

  (4)explode,implode,join
  这些是和数组有关的函数.
  explode(字符串,分割符)返回一个将字符串在分割符处分开所产生的数组.
  implode(数组,分割符)返回一个将数组各元素之间插上分割符而成的字符串.
  join与implode意义相同.

  (5)Chop
  去掉字符串尾部的空白.

  (6)htmlspecialchars
  将字符串中的HTML特殊字符换成它们的名字,例如"< "变成"<".

  (7)nl2br
  在字符串中的每一个回车前面加上"< BR>".

  (8)AddSlashes,StripSlashes
  分别给字符串中需要加上""才能用于数据库查询的字符加上和去掉"".

  (9)parse_str
  将"name1=value1&name2=value2&..."类型的字符串分析成一些变量.
  例如:
  parse_str("a=1&b=2");
  生成$a与$b两个变量,值分别为1,2. 如果有两对名字/值的名字部分相同,则后一个的值覆盖前一个的. 如果这两对的名字尾部都有"",例如"a=1&a=2",则生成数组$a,两个元素分别为1,2


技术大类 » PHP/JS/Shell | 评论(24) | 引用(0) | 阅读(17637)
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