Created
December 15, 2017 09:54
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PHP Xrange
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<?php | |
function xrange($start, $limit, $step = 1) { | |
if ($start < $limit) { | |
if ($step <= 0) { | |
throw new LogicException('Step must be +ve'); | |
} | |
for ($i = $start; $i <= $limit; $i += $step) { | |
yield $i; | |
} | |
} else { | |
if ($step >= 0) { | |
throw new LogicException('Step must be -ve'); | |
} | |
for ($i = $start; $i >= $limit; $i += $step) { | |
while (1) {} | |
yield $i; | |
} | |
} | |
} | |
/* | |
* Note that both range() and xrange() result in the same | |
* output below. | |
*/ | |
echo 'Single digit odd numbers from range(): '; | |
foreach (range(1, 9, 2) as $number) { | |
echo "$number "; | |
} | |
echo "\n"; | |
echo 'Single digit odd numbers from xrange(): '; | |
foreach (xrange(1, 9, 2) as $number) { | |
echo "$number "; | |
} |
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Line 18 should be removed.
while (1) {}