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<td align="CENTER" height="18"><h4>如何使用PHP中的字符串函数</h4>
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<td width=580 style="word-wrap:break-word; font-size: 14px; line-height: 160%"><P><SPAN style=\"FONT-SIZE: 9pt; LINE-HEIGHT: 15pt\">PHP中的字符串操作功能是比较多的,重要的有以下这些: <BR><BR><STRONG>(1)echo,print,printf,sprintf <BR></STRONG>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. <BR>后两个函数类似于C的同名函数. <BR><BR><STRONG>(2)strchr,strlen,strtok,strrchr,strrev,strstr,strtolower, <BR></STRONG>strtoupper,substr,ucfirst <BR>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. <BR>strrev是把一个字符串翻转. <BR>strtolower和strtoupper的意思应该不用解释了. <BR>ucfirst是把字符串的第一个字符变成大写. <BR>substr是返回字符串的一个子串,用法是:substr(字符串,头,长度).<BR>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. <BR><BR><STRONG>(3)Chr,Ord <BR></STRONG>类似于C的同名函数. <BR><BR><STRONG>(4)explode,implode,join <BR></STRONG>这些是和数组有关的函数. <BR>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. <BR>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. <BR>join与implode意义相同. <BR><BR><STRONG>(5)Chop <BR></STRONG>去掉字符串尾部的空白. <BR><BR><STRONG>(6)htmlspecialchars <BR></STRONG>将字符串中的HTML特殊字符换成它们的名字,例如\"<\"变成\"<\". <BR><BR><STRONG>(7)nl2br <BR></STRONG>在字符串中的每一个回车前面加上\"<BR>\". <BR><BR><STRONG>(8)AddSlashes,StripSlashes <BR></STRONG>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\"\\". <BR><BR><STRONG>(9)parse_str <BR></STRONG>将\"name1=value1&name2=value2&...\"类型的字符串分析成一些变量. <BR>例如: <BR> parse_str(\"a=1&b=2\"); <BR>生成$a与$b两个变量,值分别为1,2. <BR>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. <BR>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</SPAN></P>
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