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/php/filter.examples.validation.html

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  1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    2. 

  2. <html>
    3. 

  3.  <head>
    4. 

  4.   <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    5. 

  5.   <title>Validation</title>
    6. 

  6. 

  7.  </head>
    8. 

  8.  <body><div class="manualnavbar" style="text-align: center;">
    9. 

  9.  <div class="prev" style="text-align: left; float: left;"><a href="filter.examples.html">范例</a></div>
    10. 

  10.  <div class="next" style="text-align: right; float: right;"><a href="filter.examples.sanitization.html">Sanitization</a></div>
    11. 

  11.  <div class="up"><a href="filter.examples.html">范例</a></div>
    12. 

  12.  <div class="home"><a href="index.html">PHP Manual</a></div>
    13. 

  13. </div><hr /><div id="filter.examples.validation" class="section">
    14. 

  14.   <h2 class="title">Validation</h2>
    15. 

  15.   <p class="para">
    16. 

  16.    <div class="example" id="example-4843">
    17. 

  17.     <p><strong>Example #1 Validating email addresses with  <span class="function"><a href="function.filter-var.html" class="function">filter_var()</a></span></strong></p>
    18. 

  18.     <div class="example-contents">
    19. 

  19. <div class="phpcode"><code><span style="color: #000000">
    20. 

  20. <span style="color: #0000BB">&lt;?php<br />$email_a&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'joe@example.com'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$email_b&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'bogus'</span><span style="color: #007700">;<br /><br />if&nbsp;(</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$email_a</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FILTER_VALIDATE_EMAIL</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"This&nbsp;(email_a)&nbsp;email&nbsp;address&nbsp;is&nbsp;considered&nbsp;valid."</span><span style="color: #007700">;<br />}<br />if&nbsp;(</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$email_b</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FILTER_VALIDATE_EMAIL</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"This&nbsp;(email_b)&nbsp;email&nbsp;address&nbsp;is&nbsp;considered&nbsp;valid."</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
    21. 

  21. </span>
    22. 

  22. </code></div>
    23. 

  23.     </div>
    24. 

  24. 

  25.     <div class="example-contents"><p>以上例程会输出：</p></div>
    26. 

  26.     <div class="example-contents screen">
    27. 

  27. <div class="cdata"><pre>
    28. 

  28. This (email_a) email address is considered valid.
    29. 

  29. </pre></div>
    30. 

  30.     </div>
    31. 

  31.    </div>
    32. 

  32.   </p>
    33. 

  33. 

  34.   <p class="para">
    35. 

  35.    <div class="example" id="example-4844">
    36. 

  36.     <p><strong>Example #2 Validating IP addresses with  <span class="function"><a href="function.filter-var.html" class="function">filter_var()</a></span></strong></p>
    37. 

  37.     <div class="example-contents">
    38. 

  38. <div class="phpcode"><code><span style="color: #000000">
    39. 

  39. <span style="color: #0000BB">&lt;?php<br />$ip_a&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'127.0.0.1'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$ip_b&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'42.42'</span><span style="color: #007700">;<br /><br />if&nbsp;(</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$ip_a</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FILTER_VALIDATE_IP</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"This&nbsp;(ip_a)&nbsp;IP&nbsp;address&nbsp;is&nbsp;considered&nbsp;valid."</span><span style="color: #007700">;<br />}<br />if&nbsp;(</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$ip_b</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FILTER_VALIDATE_IP</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"This&nbsp;(ip_b)&nbsp;IP&nbsp;address&nbsp;is&nbsp;considered&nbsp;valid."</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
    40. 

  40. </span>
    41. 

  41. </code></div>
    42. 

  42.     </div>
    43. 

  43. 

  44.     <div class="example-contents"><p>以上例程会输出：</p></div>
    45. 

  45.     <div class="example-contents screen">
    46. 

  46. <div class="cdata"><pre>
    47. 

  47. This (ip_a) IP address is considered valid.
    48. 

  48. </pre></div>
    49. 

  49.     </div>
    50. 

  50.    </div>
    51. 

  51.   </p>
    52. 

  52. 

  53.   <p class="para">
    54. 

  54.    <div class="example" id="example-4845">
    55. 

  55.     <p><strong>Example #3 Passing options to  <span class="function"><a href="function.filter-var.html" class="function">filter_var()</a></span></strong></p>
    56. 

  56.     <div class="example-contents">
    57. 

  57. <div class="phpcode"><code><span style="color: #000000">
    58. 

  58. <span style="color: #0000BB">&lt;?php<br />$int_a&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'1'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$int_b&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'-1'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$int_c&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'4'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$options&nbsp;</span><span style="color: #007700">=&nbsp;array(<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'options'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;array(<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'min_range'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'max_range'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)<br />);<br />if&nbsp;(</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$int_a</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FILTER_VALIDATE_INT</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$options</span><span style="color: #007700">)&nbsp;!==&nbsp;</span><span style="color: #0000BB">FALSE</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"This&nbsp;(int_a)&nbsp;integer&nbsp;is&nbsp;considered&nbsp;valid&nbsp;(between&nbsp;0&nbsp;and&nbsp;3).\n"</span><span style="color: #007700">;<br />}<br />if&nbsp;(</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$int_b</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FILTER_VALIDATE_INT</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$options</span><span style="color: #007700">)&nbsp;!==&nbsp;</span><span style="color: #0000BB">FALSE</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"This&nbsp;(int_b)&nbsp;integer&nbsp;is&nbsp;considered&nbsp;valid&nbsp;(between&nbsp;0&nbsp;and&nbsp;3).\n"</span><span style="color: #007700">;<br />}<br />if&nbsp;(</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$int_c</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FILTER_VALIDATE_INT</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$options</span><span style="color: #007700">)&nbsp;!==&nbsp;</span><span style="color: #0000BB">FALSE</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"This&nbsp;(int_c)&nbsp;integer&nbsp;is&nbsp;considered&nbsp;valid&nbsp;(between&nbsp;0&nbsp;and&nbsp;3).\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$options</span><span style="color: #007700">[</span><span style="color: #DD0000">'options'</span><span style="color: #007700">][</span><span style="color: #DD0000">'default'</span><span style="color: #007700">]&nbsp;=&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">;<br />if&nbsp;((</span><span style="color: #0000BB">$int_c&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #0000BB">$int_c</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FILTER_VALIDATE_INT</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$options</span><span style="color: #007700">))&nbsp;!==&nbsp;</span><span style="color: #0000BB">FALSE</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"This&nbsp;(int_c)&nbsp;integer&nbsp;is&nbsp;considered&nbsp;valid&nbsp;(between&nbsp;0&nbsp;and&nbsp;3)&nbsp;and&nbsp;is&nbsp;</span><span style="color: #0000BB">$int_c</span><span style="color: #DD0000">."</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
    59. 

  59. </span>
    60. 

  60. </code></div>
    61. 

  61.     </div>
    62. 

  62. 

  63.     <div class="example-contents"><p>以上例程会输出：</p></div>
    64. 

  64.     <div class="example-contents screen">
    65. 

  65. <div class="cdata"><pre>
    66. 

  66. This (int_a) integer is considered valid (between 0 and 3).
    67. 

  67. This (int_c) integer is considered valid (between 0 and 3) and is 1.
    68. 

  68. </pre></div>
    69. 

  69.     </div>
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  70.    </div>
    71. 

  71.   </p>
    72. 

  72.  </div><hr /><div class="manualnavbar" style="text-align: center;">
    73. 

  73.  <div class="prev" style="text-align: left; float: left;"><a href="filter.examples.html">范例</a></div>
    74. 

  74.  <div class="next" style="text-align: right; float: right;"><a href="filter.examples.sanitization.html">Sanitization</a></div>
    75. 

  75.  <div class="up"><a href="filter.examples.html">范例</a></div>
    76. 

  76.  <div class="home"><a href="index.html">PHP Manual</a></div>
    77. 

  77. </div></body></html>
    78. 

  78.