Single line PHP codes

[Tony]

Validate the format of a domain name:

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if (!preg_match("(^([-a-z0-9]+\.)+[a-z]{2,4}$)i", $domain)) echo "Domain name $domain is not valid";  

Validate the format of an email address:

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if (!preg_match("(^[-\w\.]+@([-a-z0-9]+\.)+[a-z]{2,4}$)i", $email)) echo "Email address $email is not valid";  

Validate the format of the user name and verify valid MX records for the domain name (OK, so it is two lines):

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list($username, $domaintld) = split("@", $email, 2);
if (!getmxrr($domaintld, $mxrecords) OR !preg_match("(^[-\w\.]+$)", $username)) echo "Email address $email is not valid";  

Remove one element from an array (in this example remove $image from array $image_array):

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$image_array = array_merge(array_diff($image_array,(array)$image));  

Randomly select of one element out of an array:

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$image = $image_array[array_rand($image_array)];  

Eliminate duplicate (or more) characters in a string (the underscore in the example below):

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$text = preg_replace('#(_)+#','_',$text);  

Include using a full unix path while still maintaining script portability:

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include($_SERVER['DOCUMENT_ROOT'] . '/file.inc');  

Pass the htaccess/htpassword authenticated user to a script:

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$user = $_SERVER['REMOTE_USER'];  

Set the server time zone (Eastern time in this example):

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putenv('TZ=EST5EDT'); // eastern time   

Debug $_GET variables by displaying the whole search string:

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echo $_SERVER['QUERY_STRING'];  

Show the last modified date:

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echo "Last modified: ".date ("F d, Y", getlastmod());  

Read a flat file (file.txt in this example) in as an array and remove line breaks:

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$newArray = preg_replace("#\r\n?|\n#","",file('file.txt'));  

Scrub html output:

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$output = strtr($output,array('&'=>'&','<'=>'<','>'=>'>'));