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What does this line do?

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Nov 08.2013

Hi

I’m fairly new to PHP and trying to understand what a script is doing.

This line has me puzzled:

[CODE]$img=preg_match(‘/d/’,$selectedImage)?$selectedImage:’none’;[/CODE]

I understand that the first part is looking for numeric characters in the variable, but what does the ? signify.

Thanks,

Mike

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PHP

9 Comments(s) ↴

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@ispanico82Nov 08.2013 — Can you give me the previous row code?
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@NogDogNov 08.2013 — The ? and : together form the [url=www.php.net/manual/en/language.operators.comparison.php#language.operators.comparison.ternary]ternary operator[/url].
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@bionoidNov 08.2013 — If the value of $selectedImage contains a number (d) then it will return the value of $selectedImage, if not then it will return the string "none".

The return result of the expression will be assigned to the variable $img for use elsewhere.
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@priyankagoundNov 09.2013 — ? signify that it will match the preceding pattern zero or one times.

Well.., u can refer below link to clear more doubts abt regex.

http://www.noupe.com/php/php-regular-expressions.html

Hope this helps.
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@PTOauthorNov 09.2013 — Can you give me the previous row code?[/QUOTE]

Yes, it's:

[CODE]$selectedImage=$_GET['i'];[/CODE]

Mike
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@PTOauthorNov 09.2013 — If the value of $selectedImage contains a number (d) then it will return the value of $selectedImage, if not then it will return the string "none".

The return result of the expression will be assigned to the variable $img for use elsewhere.[/QUOTE]

So it's like an IF expression?

Mike
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@bionoidNov 09.2013 — So it's like an IF expression?[/QUOTE]

It's more like a shorthand IF ELSE ?

(expression) ? (expression was true) : (expression was false);
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@PTOauthorNov 09.2013 — ? signify that it will match the preceding pattern zero or one times.

Well.., u can refer below link to clear more doubts abt regex.

http://www.noupe.com/php/php-regular-expressions.html

Hope this helps.[/QUOTE]

Great resource, thank you.

Mike
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@PTOauthorNov 09.2013 — It's more like a shorthand IF ELSE ?

(expression) ? (expression was true) : (expression was false);[/QUOTE]

Gotcha, thanks ?

Mike
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