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读书笔记:php_tizag_tutorial

Jun 23, 2016 pm 01:31 PM

  昨天在实验室花了一天时间看了英文版的php_tizag_tutorial,因为上学期用php和bootstrap写过一个租房网站,对php还是比较熟悉.现在总结一下php_tizag_tutorial里面一些没用过或者遗忘的知识点.


1.打印的字符串里面包含引号时,要注意采取下面的两种方式之一:
1). 在引号前加上反斜杠"\".
2). 使用单引号.
举例如下:

1 <?php2 // This won't work because of the quotes around specialH5!3 echo "<h5 id="I-love-using-PHP">I love using PHP!</h5>";4 // OK because we escaped the quotes!5 echo "<h5 id="I-love-using-PHP">I love using PHP!</h5>";6 // OK because we used an apostrophe '7 echo "<h5 id="I-love-using-PHP">I love using PHP!</h5>";8 ?>
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2.String Creation Heredoc
  使用<<<和自定义的一些标识符(这里用的是TEST)开始字符串的heredoc,最后以"标识符;"作为结束标志.
注意标识符要在单独一行,不可缩进.
举例如下:

1 $my_string = <<<TEST2 Tizag.com3 Webmaster Tutorials4 Unlock your potential!5 TEST;6 echo $my_string;
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输出结果:

1 Tizag.com Webmaster Tutorials Unlock your potential!
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3.include函数与require函数的区别
  使用include函数时,若出现错误,只是提出警告,代码依然执行下去;使用require函数时,则会报错,并且终止执行下去.
强烈推荐使用后者.

4.POST与GET的区别
1). POST
HTML代码片段:

1 <form action="process.php" method="post">2 <select name="item">3 ...4 <input name="quantity" type="text" />
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PHP代码片段:

1 $quantity = $_POST['quantity'];2 $item = $_POST['item'];
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2). GET

HTML代码片段:

1 <form action="process.php" method="get">2 <select name="item">3 ...4 <input name="quantity" type="text" />
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PHP代码片段:

1 $quantity = $_GET['quantity'];2 $item = $_GET['item'];
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3). 两者区别

  GET传递数据是通过url,上面的例子中跳转到process.php页面是,会在url后面附上"?item=##&quantity=##",其中?是告诉浏览器接下来的这几项是变量.所以,传递重要信息如密码等,就不要使用GET方式传递数据,这样会完全暴露出来,非常不安全.

5.PHP创建文件
  在PHP中,fopen函数用于打开一个文件,当该文件不存在时,就创建该文件.

1 $ourFileName = "testFile.txt";2 $ourFileHandle = fopen($ourFileName, 'w') or die("can't open file");3 fclose($ourFileHandle);
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6.PHP打开文件
  打开文件的方式有几种:
1). Read: 'r'
只读,文件指针在文件开头.
2). Write: 'w'
只写,文件指针在文件开头.而且会把之前的内容覆盖.
3). Append: 'a'
只写,文件指针在文件末尾.

7.PHP删除文件
  使用unlink函数.

1 $myFile = "testFile.txt";2 unlink($myFile);
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8.PHP在字符串里匹配字段
  使用strpos函数返回相应字段位置.
  举例如下:

1 $numberedString = "1234567890"; // 10 numbers from 1 to 02 $fivePos = strpos($numberedString, "5");3 echo "The position of 5 in our string was $fivePos";
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  结果如下:

1 The position of 5 in our string was 42 3 Finding All Occurrences in a String with Offset
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  举例如下:

1 $numberedString = "1234567890123456789012345678901234567890";2 $offset = 0; // initial offset is 03 $fiveCounter = 0;4 while($offset = strpos($numberedString, "5", $offset + 1)){5 $fiveCounter++;6 echo "<br />Five #$fiveCounter is at position - $offset";7 }
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  结果如下:

1 Five #1 is at position - 4 2 Five #2 is at position - 143 Five #3 is at position - 244 Five #4 is at position - 34
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9.PHP分割字符串
  使用explode函数.
  举例如下:

1 $rawPhoneNumber = "800-555-5555";2 $phoneChunks = explode("-", $rawPhoneNumber);3 echo "Raw Phone Number = $rawPhoneNumber <br />";4 echo "First chunk = $phoneChunks[0]<br />";5 echo "Second chunk = $phoneChunks[1]<br />";6 echo "Third Chunk chunk = $phoneChunks[2]";
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  结果如下:

1 Raw Phone Number = 800-555-55552 First chunk = 8003 Second chunk = 5554 Third Chunk chunk = 5555
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10.PHP连接字符串
  使用implode函数.

 

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