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PHP Control Structures (Loop)

PHP Control Structures (Loop)
What will be the output of the following PHP code ?
$i = 0;
while(?++$i || --$i) {
print $i;
}

1234567891011121314...infinitely
1
01234567891011121314...infinitely
0

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PHP Control Structures (Loop)
What will be the output of the following PHP code ?
do {
print "hi";
}
while(0);
print "hello";

hihello
infinite loop
hello
error

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PHP Control Structures (Loop)
What will be the output of the following PHP code ?
$x = 1;
if ($x--)
print "hi"
$x--;
else
print "hello"

error
hello
hi
no output

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PHP Control Structures (Loop)
What will be the output of the following PHP code ?
$a = 10;
$b = 11;
if ($a < ++$a || $b < ++$b)
print "hello";
else
print "hi";

error
no output
hi
hello

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PHP Control Structures (Loop)
What will be the output of the following PHP code ?
if (print "hi" - 1)
print "hello"

hihello
hi
no output
error

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PHP Control Structures (Loop)
What will be the output of the following PHP code ?
if (!print "hi")
if (print "hello")
print "hi";

hihi
hi
no output
hihellohi

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