Mask mailadresses like s*****@************m

mask_mail_adress.php

<?php
	$adress = 'sample@examples.com';

	echo get_masked_mailadress( $adress, 10 ) . "\n";
	echo get_masked_mailadress( $adress, 95 ) . "\n";
	echo get_masked_mailadress( $adress, 30 ) . "\n";
	echo get_masked_mailadress( $adress, 5 ) . "\n";

	# Return masked eMail adress
	# Strip x% from the string length at both parts from a email adress
	#
	# @param $adress string mailadress
	# @param $x int percent to strip
	function get_masked_mailadress( $adress, $x = 70 ) {

		$adress = explode( '@', $adress );

		if( count( $adress ) == 2 ){

			$_first_lenght 	= get_strip_len( strlen( $adress[0] ), $x );
			$_second_lenght = get_strip_len( strlen( $adress[1] ), $x );

			$adress[0] = substr( $adress[0], 0, 0 - $_first_lenght );
			$adress[1] = substr( $adress[1], $_second_lenght );

			return $adress[0] . get_mask_char( $_first_lenght ) . '@' . get_mask_char( $_second_lenght ) . $adress[1];

		}

		return 'Invalid mailadress';

	}

	# Calculate the strip lenght for a string
	#
	# @param $str string
	# @param $percent int
	function get_strip_len( $str, $percent ){

		$len = ( $str-round( ($str*$percent/100), 0) );

		if( $len == 0 ){
			$len = $str + 1;
		}

		return $len;

	}

	# Returns masket chars
	# @param $lenght int
	function get_mask_char( $lenght ){

		$mask_char = false;

		for( $i = 1; $i <= $lenght; $i++ ){
			$mask_char .= '*';
		}

		return $mask_char;

	}