字符串操作函数
函数|字符串
PHP3.0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
用于输出字符串.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
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是将字符串转换为小写和大写.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
同名函数.
(4)explode,implode,join
与数组有关的函数. 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
处理串尾部的空白.
(6)htmlspecialchars
将HTML特殊字符换成它们的名字,例如"
(7)nl2br
在HTML中的每一个回车前面加上"
".
(8)AddSlashes,StripSlashes
给字符串中按照需要加上"\"和去掉"\"，对于某些数据库，必须在要查询的字符加上和去掉"\"之后才能够查询.
(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.
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