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if..endif syntax

The `alternative' way to write if/elseif/else statements, using if(); elseif(); else; endif; cannot be efficiently implemented without adding a large amount of complexity to the 3.0 parser. Because of this, the syntax has been changed:

Example C-5. Migration: old if..endif syntax

if ($foo);
    echo "yep\n";
elseif ($bar);
    echo "almost\n";
else;
    echo "nope\n";
 endif;

Example C-6. Migration: new if..endif syntax

if ($foo):
    echo "yep\n";
elseif ($bar):
    echo "almost\n";
else:
    echo "nope\n";
 endif;
Notice that the semicolons have been replaced by colons in all statements but the one terminating the expression (endif).

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