16 lines
706 B
PHP
16 lines
706 B
PHP
function bitwise($a, $b)
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{
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function zerofill($a,$b) {
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if($a>=0) return $a>>$b;
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if($b==0) return (($a>>1)&0x7fffffff)*2+(($a>>$b)&1); // this line shifts a 0 into the sign bit for compatibility, replace with "if($b==0) return $a;" if you need $b=0 to mean that nothing happens
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return ((~$a)>>$b)^(0x7fffffff>>($b-1));
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echo '$a AND $b: ' . $a & $b . '\n';
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echo '$a OR $b: ' . $a | $b . '\n';
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echo '$a XOR $b: ' . $a ^ $b . '\n';
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echo 'NOT $a: ' . ~$a . '\n';
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echo '$a << $b: ' . $a << $b . '\n'; // left shift
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echo '$a >> $b: ' . $a >> $b . '\n'; // arithmetic right shift
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echo 'zerofill($a, $b): ' . zerofill($a, $b) . '\n'; // logical right shift
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}
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