/******************************************************************* 

 * This function highlight a wanted keyword in a text.

 * 

 * @param string $strHaystack raw text

 * @param string $strNeedle wanted keyword(s)

 * @param string $strColor color in hexa decimal

 * @param string $strStyle color style (color|background-color)

 * @param bool $bCase case sensitive (True|False)

 * @return string

 *******************************************************************/

function searchmarker ( $strHaystack, $strNeedle, $strColor = '', $strStyle = '', $bCase = False ) {

(string) $strModifier = '';

if ( empty ( $strColor ) ) $strColor = '#ff0000';

if ( empty ( $strStyle ) ) $strStyle = 'color';

// Modifikator "i": Gross- und Kleinschreibung ignorieren.

if ( $bCase ) $strModifier = 'i';

(string) $strQuotedNeedle = preg_quote ( $strNeedle, '/' );

(string) $strPattern = '/' . $strQuotedNeedle . '/' . $strModifier;

(string) $strReplacement = '<span style="'.$strStyle.': '.$strColor.';">$0</span>';

return preg_replace ( $strPattern, $strReplacement, $strHaystack );

}

// @example

$cfg['search'] = array( 'case' => False,

			'style' => 'background-color',

			'color' => '#ffff00'

);

(array) $data = array( 'mschulz', 'tklets', 'eschulz', 'pschulz' );

(string) $regexp = 'Ul';

foreach ( $data as $vars ) {

	echo searchmarker( $vars, $regexp, $cfg['search']['color'], $cfg['search']['style'], $cfg['search']['case'] )."<br/>";

}