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php -- 字符串操作

2024-07-05 23:38:07   233人阅读

----- 014-string.php -----

 1 <!DOCTYPE html>
 2 <html>
 3 <head>
 4     <meta http-equiv="content-type" content="text/html; charset=utf-8">
 5     <title>一个PHP网页</title>
 6 </head>
 7 <body>
 8 <pre>
 9 <?php
10     echo "<h3>字符串比较</h3>";
11     $str1 = "hello";
12     $str2 = "HELLO";
13     printf("%s比%s：%d\n", $str1, $str2, strcmp($str1, $str2));
14     printf("%s比%s不区分大小写：%d\n", $str1, $str2, strcasecmp($str1, $str2));
15     $str1 = "helWWW";
16     $str2 = "HELQQQ";
17     printf("%s比%s，前三个字符：%d\n", $str1, $str2, strncmp($str1, $str2, 3));
18     printf("%s比%s，前三个字符，不区分大小写：%d\n", $str1, $str2, strncasecmp($str1, $str2, 3));
19 ?>
20 <?php
21     echo "<h3>字符串替换</h3>";
22     $str = "葫芦";
23     $result = str_replace("葫芦", "葫芦娃", $str, $count);
24     printf("葫芦(葫芦->葫芦娃):%s。替换了%d次\n", $result, $count);
25     $result = substr_replace($str, "葫芦娃", 3, 3);//UTF-8
26     printf("葫芦(2+2->葫芦娃):%s。\n", $result);
27 ?>
28 <?php
29     echo "<h3>截取字符串</h3>";
30     $str = "植物大战大僵尸";
31     printf("植物大战大僵尸，从大开始：%s\n", strchr($str, "大"));
32     printf("植物大战大僵尸，从大开始，取左半部分：%s\n", strchr($str, "大", true));
33     printf("植物大战大僵尸，大的位置：%d\n", strpos($str, "大", 0));
34     printf("植物大战大僵尸，大的位置：从第三个字开始%d\n", strpos($str, "大", 9));
35     printf("植物大战大僵尸，从右边的大开始：%s\n", strrchr($str, "大"));
36     printf("植物大战大僵尸，从第二个字符开始：%s\n", substr($str, 3));
37     printf("植物大战大僵尸，大出现次数：%s\n", substr_count($str, "大"));
38 ?>
39 <?php
40     echo "<h3>分割字符串</h3>";
41     $str = "植物 大战 僵尸";
42     $s = strtok($str, " ");
43     while ($s) {
44         echo $s, "\n";
45         $s = strtok(" ");
46     }
47     foreach(explode(" ", $str) as $temp){
48         echo $temp, "\t";
49     }
50     echo implode("+", array("植物", "大战", "僵尸"));
51 ?>
52 <?php
53     echo "<h3>大小写转换</h3>";
54     echo strtolower("PHP"), "\n";
55     echo strtoupper("java"), "\n";
56     echo ucfirst("what you see is what you get"), "\n";
57     echo ucwords("what you see is what you get"), "\n";
58     foreach(count_chars("abbcccdddd", 1) as $key=>$value){
59         echo $key, "=>", $value, "\n";
60     }
61 ?>
62 <?php
63     echo "<h3>字符串填充</h3>";
64     $arr = array("柯南", "海贼王", "火影忍者", "樱桃小丸子");
65     foreach ($arr as $value) {
66         echo str_pad($value, 18, "—", STR_PAD_LEFT);
67         echo "\n";
68     }
69 ?>
70 <?php
71     echo "<h3>字符串剔除</h3>";
72     $str = "**  滴滴动力**  ";
73     echo "待剔除字符串：|", $str, "|\n";
74     echo "剔除空格|", trim($str), "|\n";
75     echo "剔除星号|", trim($str, "*"), "|\n";
76     echo "剔除星号空格|", trim($str, "* "), "|\n";
77     echo "左剔除星号空格|", ltrim($str, "* "), "|\n";
78     echo "右剔除星号空格|", rtrim($str, " *"), "|\n";
79 ?>
80 </pre>
81 </body>
82 </html>


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