I'm working on a class to manipulate html hex color codes in php. Internally, the class treats RGB values as decimals. When I'm adding or subtracting, I never want the value to exceed 255 nor 'subceed' zero.
If course, I can do something piecemeal like
if ( $val > 255 ) {
$val = 255;
}
if ( $val < 0 ) {
$val = 0;
}
But that's verbose :P
Is there a clever, one-linish way I can get the value to stay between 0 and 255?
SIGNED, UNSIGNED and ZEROFILL For example, a TINYINT SIGNED can range from -128 to 127. If UNSIGNED is specified, no portion of the numeric type is reserved for the sign, so for integer types range can be larger. For example, a TINYINT UNSIGNED can range from 0 to 255.
If unsigned, the allowable range is from 0 to 4294967295. You can specify a width of up to 11 digits. TINYINT − A very small integer that can be signed or unsigned. If signed, the allowable range is from -128 to 127. If unsigned, the allowable range is from 0 to 255.
TINYINT is a very small integer. The minimum and maximum SIGNED values are -128 and 127 respectively, while for UNSIGNED values TINYINT range is from 0 to 255. TINYINT uses 1 byte per row.
A medium-sized integer. The signed range is -8388608 to 8388607. The unsigned range is 0 to 16777215. ZEROFILL pads the integer with zeroes and assumes UNSIGNED (even if UNSIGNED is not specified). INT3 is a synonym for MEDIUMINT .
You could possibly say something like: $val = max(0, min(255, $val));
Using the bitwise OR operator would work
if(($num | 255) === 255) { /* ... */ }
Example:
foreach (range(-1000, 1000) as $num) {
if(($num | 255) === 255) {
echo "$num, ";
};
}
would print out all the numbers from 0 to 255.
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