php中的字符串处理【拍砖】

//字符串处理函数



//根据ascII返回相应的字母

echo "ascII为66的字母是:". chr(66)."<br>";



//chop 去除字符串中的连续空格和空白

$str="		 he llo wo rd	 ";echo "s:";

echo "s:".chop($str)."w";



//explode 按照某个字符分割字符串 返回数组

$str="green,red,yellow,white";

$arr=explode(" ",$str);echo "分割后的数组是:";

print_r($arr);



//implode 将数组按照某个字符拼成字符串

$arr=array("a","b","c","d");

$str=implode('/',$arr);

echo "<br>拼成的字符串是:".$str;



//打印print

print("打印的方法print");

echo "格式化打印printf:<br>";

printf("%f%",2,"d");



//不区分大小写比较字符串

echo "不区分大小写:".strcasecmp("hello word","HELLO Word");

//区分大小写

echo "区分大小写:". strcmp("hello word","HELLO Word");



//查找字符串

echo "查找的结果是:". strchr("hello word","hello");

//字符串长度

echo "str长度:".strlen("hello word");



//将字符串重复几次str_repeat

echo "将字符串重复几次:".str_repeat("ws",3);



//将字符串倒序排列

echo "zifuchuandaoxu:".strrev("zifuchuandaoxu");



//将字符串大写，小写转化

//strtolower();

//strtoupper();

//字符串替换,

echo "替换后的字符串是:". str_replace("b","*","aaaaabbbbbccccc");

//切割字符串

echo "切割后的字符串是:". substr("hello word",2,3);