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<?php |
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/** |
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* Scheme Class |
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* |
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* This class has all the predefined HSL scheme algorithms. |
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*/ |
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namespace projectcleverweb\color; |
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/** |
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* Scheme Class |
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* |
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* This class has all the predefined HSL scheme algorithms. |
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*/ |
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class yiq_scheme extends scheme { |
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/** |
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* A static reference to this class. (important for late static binding) |
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* @var string |
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*/ |
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protected static $this_class = __CLASS__; |
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/** |
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* These colors are all close to each other on a color wheel. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 analogous colors where the first offset is the original input. |
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*/ |
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public static function analogous_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::analogous_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* 2 of these colors are a different shade of the base color. The other 2 are |
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* a weighted opposite of the base color. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 complementary colors where the first offset is the original input. |
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*/ |
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public static function complementary_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::complementary_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* These colors use mathematical offsets that usually complement each other |
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* well, and can highlight the base color. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 compounding colors where the first offset is the original input. |
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*/ |
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public static function compound_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::compound_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* 5 complementary shades of one color. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 complementary shades of colors where the first offset is the original input. |
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*/ |
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public static function monochromatic_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::monochromatic_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* 5 different shades of one color. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 shades of a color where the first offset is the original input. |
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*/ |
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public static function shades_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::shades_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* 3 of these colors are all equally distanced from each other on a color |
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* wheel, plus 1 alternated shade for the base color and the 1 color that is |
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* opposite of the base color. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 triangular colors where the first offset is the original input. |
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*/ |
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public static function tetrad_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::tetrad_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* 3 of these colors are all similarly distanced from each other on a color |
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* wheel, the base color has an alternate shade, and there is a weighted |
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* opposite color. These colors are all slightly closer to the base color |
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* than in a normal tetrad. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 triangular colors where the first offset is the original input. |
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*/ |
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public static function weighted_tetrad_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::weighted_tetrad_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* These colors are all equally distanced from each other on a color wheel, |
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* 2 of which have an alternate shade. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 triangular colors where the first offset is the original input. |
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*/ |
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public static function triad_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::triad_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* These colors are all similarly distanced from each other on a color wheel, |
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* 2 of which have an alternate shade. These colors are all slightly closer to |
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* the base color than in a normal triad. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 weighted triangular colors where the first offset is the original input. |
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*/ |
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public static function weighted_triad_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::weighted_triad_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* 4 of these colors form a rectangle on a color wheel, and 1 color is an |
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* alternate shade for the base color. |
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* |
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* @param float $h The base color hue degree (0 - 359) |
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* @param float $s The base color saturation percentage (0 - 100) |
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* @param float $l The base color lighting percentage (0 - 100) |
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* @param bool|null $is_dark Whether or not to treat the base color as a dark color. Leave as null to dynamically generate this. |
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* @return array An array of 5 rectangular colors where the first offset is the original input. |
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*/ |
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public static function rectangular_set (float $h = 0.0, float $s = 0.0, float $l = 0.0, $is_dark = NULL) :array { |
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return static::set_adjust(parent::rectangular_set($h, $s, $l, $is_dark)); |
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} |
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/** |
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* Adjusts a hue in the YIQ spectrum |
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* |
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* @param float $current The current hue |
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* @param float $mod The desired amount of change (0 - 359; is converted to a percentage) |
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* @return int The resulting hue |
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*/ |
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protected static function yiq_adjust(float $current, float $mod) :int { |
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if ($mod == 0) { |
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return $current; |
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} |
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$change = regulate::div($mod, 360) * 1000; |
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$current_yiq = generate::hue_to_yiq($current); |
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$new_loc = regulate::max(abs($current_yiq + $change), 1000); |
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return round(generate::yiq_to_hue($new_loc)); |
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} |
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/** |
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* Adjust a scheme array to use YIQ adjusted hues |
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* |
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* @param array $scheme The scheme to adjust |
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* @return array The resulting $scheme |
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*/ |
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protected static function set_adjust(array $scheme) :array { |
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foreach($scheme as $i => &$hsl) { |
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if ($i == 0) { |
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$org = $hsl['h']; |
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continue; |
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} |
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$hsl['h'] = static::yiq_adjust($org, $hsl['h'] - $org); |
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} |
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return $scheme; |
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} |
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} |
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If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: