What is ":" in PHP?

符号是什么意思:在PHP中是什么意思？

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PHP offers an alternative syntax for some of its control structures; namely, if, while, for, foreach, and switch. In each case, the basic form of the alternate syntax is to change the opening brace to a colon (:) and the closing brace to endif;, endwhile;, endfor;, endforeach;, or endswitch;, respectively.

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You also encounter : if you use the alternative syntax for control structures:

<?php
if ($a == 5):
    echo "a equals 5";
    echo "...";
elseif ($a == 6):
    echo "a equals 6";
    echo "!!!";
else:
    echo "a is neither 5 nor 6";
endif;
?>

Or as already mentioned the ternary operator:

$action = (empty($_POST['action'])) ? 'default' : $_POST['action'];

(Examples taken from the documentation)

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Edit: Somehow I didn't see that the alternative syntax was already mentioned, must be too tired ;) Anyway, I will leave it as it is, as I think an actual example and a link to the documentation is more helpful than just plain text.

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I'm guessing you're seeing this syntax:

print ($item ? $item : '');

This is a short form of if/else. The ? is the if, and the : is the else.

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