php 常用 字符串处理函数 及 实例

2008-08-01 22:15

6-6.php






$str=" 你看不到我 我是空格 ";
echo "方括号中为原始字符串:[".$str."]
";
echo "原始字符串长度:".strlen($str)."
";
$str1=ltrim($str);
echo "执行ltrim()之后的长度:".strlen($str1)."
";
$str2=rtrim($str);
echo "执行rtrim()之后的长度:".strlen($str2)."
";
$str3=trim($str);
echo "执行trim()之后的长度:".strlen($str3)."
";
echo "去掉首尾空格之后的字符串:[".$str3."]";
?>


===============================================================

6-7.php






$str="ni hao , wo jiao Wang Xiao-ming.";
echo "原始字符串:".$str."
";
$str1=ucfirst($str);
echo "执行ucfirst()之后:".$str1."
";
$str2=ucwords($str);
echo "执行ucwords()之后:".$str2."
";
$str3=strtoupper($str);
echo "执行strtoupper()之后:".$str3."
";
$str4=strtolower($str);
echo "执行strtolower()之后:".$str4."
";
echo "字符串中一共有:".str_word_count($str)."个单词.";
?>


===============================================================

6-8.php






$str="I am an abstract about abroad.";
echo substr_count($str,"ab");
echo ", ";
echo substr_count($str,"ab",6,4);
?>


===============================================================

6-9.php






$str="I am an abstract about abroad.";
echo "原始字符串为:".$str."
";
echo "ab在字符串中的第一次出现位置为:".strpos($str,"ab")."
";
echo "ab在字符串中的最后一次出现位置为:".strrpos($str,"ab")."
";
echo "abcd在字符串中第一次出现的位置为:".strpos($str,"abcd");
?>


===============================================================

6-10.php






$str="千山鸟飞绝，万径人踪灭，孤舟原理翁，独钓寒江雪。";
echo "1.原始字符串为:".$str."
";
echo "用strstr函数搜索\",\"的返回结果:".strstr($str,"，")."
";
echo "用strstr函数搜索\"孤舟\"的返回结果:".strstr($str,"孤舟")."
";
$str2="I have a great dream.";
echo "2.原始字符串为:".$str2."
";
echo "用strstr函数搜索\"e\"的返回结果:".strstr($str2,"e")."
";
echo "试图用strrchr函数搜索\"at\"的返回结果:".strrchr($str2,"at");
?>


===============================================================

6-11.php

请输入一段包含回车的文字:

$content=$_POST["content"];
//如果用户输入内容不为空
if($content!="")
{
echo "
";
echo "直接输出接受到的内容:
";
echo $content;
echo "
(内容长度:".strlen($content).")
";
echo "

---

";
echo "用nl2br()处理接收到的内容，然后输出:
";
echo nl2br($content);
echo "
(内容长度:".strlen(nl2br($content)).")
";
}
?>


===============================================================

6-12.php






//单个字符替换
$str="当所有的人[逗]离开我的时候[逗]你劝我要耐心等候[句]";
echo "原字符串:".$str."
";
$str=str_replace("[","(",$str);
$str=str_replace("]",")",$str);
echo "字符替换之后:".$str."
";
//字符串替换
$str=str_replace("(逗)",",",$str);
$str=str_replace("(句)",".",$str);
echo "字符串替换之后:".$str."
";
?>


===============================================================

6-13.php






//单个字符替换
$str="当所有的人[逗]离开我的时候[逗]你劝我要耐心等候[句]";
echo "原始字符串:".$str."
";
$arr1=array("[","]");
$arr2=array("(",")");
$str=str_replace($arr1,$arr2,$str);
echo "字符替换之后:".$str."
";
//字符串替换
$arr3=array("(逗)","(句)");
$arr4=array(",",".");
$str=str_replace($arr3,$arr4,$str);
echo "字符串替换之后:".$str."
";
?>


===============================================================

6-14.php






//构造字符串
$str="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
echo "原始字符串:".$str."
";
//按各种方式进行截取
$str1=substr($str,5);
echo "从第5个字符开始取至最后:".$str1."
";
$str2=substr($str,9,4);
echo "从第9个字符开始取4个字符:".$str2."
";
$str3=substr($str,-5);
echo "取倒数5个字符:".$str3."
";
$str4=substr($str,-8,4);
echo "从倒数第8个字符开始向后取4个字符:".$str4."
";
$str5=substr($str,-8,-2);
echo "从倒数第8个字符开始取到倒数第2个字符为止:".$str5."
";
?>


===============================================================

6-15.php






//构造字符串
$str="苹果，空心菜，香蕉，萝卜，大蒜，牛肉";
echo "原字符串:".$str."
";
echo "1.以逗号为分隔符分割字符串:
";
$arr1=explode("，",$str);
echo "---\$arr1[0]的值:".$arr1[0]."
";
echo "---\$arr1[4]的值:".$arr1[4]."
";
echo "2.分割时指定limit参数:
";
$arr2=explode("，",$str,3);
echo "---\$arr2[0]的值:".$arr2[0]."
";
echo "---\$arr2[2]的值:".$arr2[2]."
";
echo "---\$arr2[4]的值:".$arr2[4]."
";
?>


===============================================================

6-16.php






//分割英文字符串
$str="Quietly I leave,just as quietly I came.";
echo "原字符串:".$str."
";
echo "1.以默认长度分割字符串:
";
$arr1=str_split($str);
echo "---\$arr1[0]的值:".$arr1[0]."
";
echo "---\$arr1[1]的值:".$arr1[1]."
";
echo "---\$arr1[10]的值:".$arr1[10]."
";
echo "2.以指定长度为5分割字符串:
";
$arr2=str_split($str,5);
echo "---\$arr1[0]的值:".$arr2[0]."
";
echo "---\$arr1[1]的值:".$arr2[1]."
";
echo "---\$arr1[5]的值:".$arr2[5]."
";
//测试分割中文
$str2="轻轻地我走了，正如我轻轻的来。";
echo "原字符串:".$str2."
";
echo "1.以指定长度为5分割字符串:
";
$arr3=str_split($str2,5);
echo "---\$arr3[0]的值:".$arr3[0]."
";
echo "---\$arr3[1]的值:".$arr3[1]."
";
echo "2.以指定长度为4分割字符串:
";
$arr4=str_split($str2,4);
echo "---\$arr4[0]的值:".$arr4[0]."
";
echo "---\$arr4[0]的值:".$arr4[0]."
";
echo "---\$arr4[0]的值:".$arr4[0]."
";
?>


===============================================================

File create time:2008-08-01 22:14:49
By string.cpp