Created
January 25, 2012 10:30
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Mobile phone headers PHP example
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, user-scalable=yes, minimum-scale=1.0"> | |
| <title>And your phone number is...</title> | |
| <style> | |
| body { | |
| font: 17px sans-serif; | |
| color: #444; | |
| margin: 20px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <?php | |
| $headers = apache_request_headers(); | |
| foreach ($headers as $header => $value) { | |
| if ($header == 'x-up-calling-line-id') { | |
| $phone_number = $value; | |
| break; | |
| } | |
| } | |
| if (isset($phone_number)) { | |
| echo "<p>Your phone number is:</p><h1>$value</h1><p>Did you know that this number is sent to <strong>every</strong> website you visit (when not using Wi-Fi)?</p>"; | |
| } else { | |
| echo '<p>No phone number found. Make sure Wi-Fi is turned off and <a href="./">try again</a>.</p>'; | |
| } | |
| ?> | |
| <p><a href="http://www.thinkbroadband.com/news/4990-o2-shares-your-mobile-phone-number-with-every-website-you-visit.html">More info here</a>.</p> | |
| <p>Try <a href="http://lew.io/headers.php">this demo</a> by <a href="http://twitter.com/lewispeckover">@lewispeckover</a>.</p> | |
| <p><a href="https://gist.github.com/1675764">Source code for this page</a>.</p> | |
| </body> | |
| </html> |
The sentence:
$headers = apache_request_headers(); foreach ($headers as $header => $value) { if ($header == 'x-up-calling-line-id') { $phone_number = $value; break; } }
Is not guaranteed it will work.
You can simply do:
$header = apache_request_headers(); if(isset($header['x-up-calling-line-id']) && !empty($header['x-up-calling-line-id'])){ $phone_number = $header['x-up-calling-line-id']; }else{ $error_phone_number = "Phone number missing...!"; }
Using this technique, saves time, does not fail when comparing 2 strings.
By the way, a safer and more proper way to compare 2 strings is to use strcmp. It returns 0 if both strings are identical, otherwise, return 1.
Regards,
Cristian
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this is pretty scary...
PS: I believe you can just do like so
if ( !empty($headers['x-up-calling-line-id']) ) $phone_number = $value;