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<?php
/**
* Helper function to check validity of a given HEX color.
*
* Valid formats are:
* - #aabbcc
* - aabbcc
* - #abc
* - abc
*
* @since 5.2.0
* @param string $color HEX color to check validity of.
* @return bool True if a given color mathes accepted pattern, False otherwise.
*/
function su_is_valid_hex( $color ) {
return preg_match( '/^#([a-f0-9]{3}){1,2}\b$/i', $color ) === 1;
}
/**
* Helper function that expands 3-sybol string into 6-sybol by repeating each
* symbol twice.
*
* @since 5.6.0
* @param string $hex Short value.
* @return string Expanded value.
*/
function su_expand_short_color( $value ) {
if ( ! is_string( $value ) || 3 !== strlen( $value ) ) {
return $value;
}
return $value[0] . $value[0] . $value[1] . $value[1] . $value[2] . $value[2];
}
/**
* Helper function that adjusts brightness of a given HEX color value.
*
* Examples of use:
* `su_adjust_brightness( '#fc0', 50 )` - increase color brightness by 50%
* `su_adjust_brightness( 'ffcc00', -50 )` - decrease color brightness by 50%
*
* @since 5.2.0
* @param string $color A valid HEX color
* @param int $percent The percent to adjust brightness to.
* @return string Adjusted HEX color value.
*/
function su_adjust_brightness( $color, $percent ) {
if (
! su_is_valid_hex( $color ) ||
! is_numeric( $percent )
) {
return $color;
}
$percent = max( -100, min( 100, $percent ) );
$steps = round( $percent * 2.55 );
$color = ltrim( $color, '#' );
if ( 3 === strlen( $color ) ) {
$color = su_expand_short_color( $color );
}
$color_parts = str_split( $color, 2 );
$new_color = '#';
foreach ( $color_parts as $color_part ) {
$color_part = hexdec( $color_part );
$color_part = max( 0, min( 255, $color_part + $steps ) );
$new_color .= str_pad( dechex( $color_part ), 2, '0', STR_PAD_LEFT );
}
return $new_color;
}
/**
* Helper function that adjusts lightness of a given HEX color value.
*
* Examples of use:
* `su_adjust_lightness( '#fc0', 50 )` - increase color lightness by 50%
* `su_adjust_lightness( 'ffcc00', -50 )` - decrease color lightness by 50%
*
* @since 5.6.0
* @param string $color A valid HEX color
* @param int $percent The percent to adjust lightness to.
* @return string Adjusted HEX color value.
*/
function su_adjust_lightness( $color, $percent ) {
if (
! su_is_valid_hex( $color ) ||
! is_numeric( $percent )
) {
return $color;
}
$percent = max( -100, min( 100, $percent ) );
$color = ltrim( $color, '#' );
$new_color = '#';
if ( 3 === strlen( $color ) ) {
$color = su_expand_short_color( $color );
}
$color = array_map( 'hexdec', str_split( $color, 2 ) );
foreach ( $color as $part ) {
$limit = $percent < 0 ? $part : 255 - $part;
$amount = ceil( $limit * $percent / 100 );
$new_color .= str_pad( dechex( $part + $amount ), 2, '0', STR_PAD_LEFT );
}
return $new_color;
}
function su_sanitize_css_color($value) {
return preg_replace( '/[^a-z\d\#\(\)\.\-\,%]+/i', '', $value );
}