segfault.php

<?php

function wp_kses_split( $string, $allowed_html, $allowed_protocols ) {
	return preg_replace_callback( '%(<!--.*?(-->|$))|(<[^>]*(>|$)|>)%', function( $match ) use ($allowed_html, $allowed_protocols) {
		return wp_kses_split2( $match[0], $allowed_html, $allowed_protocols );
	}, $string );
}

function wp_kses_split2($string, $allowed_html, $allowed_protocols) {
	$string = str_replace( '\\"', '"', $string );
	if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches)) {
		return '';
	}
	$slash = trim($matches[1]);
	$elem = $matches[2];
	$attrlist = $matches[3];

	if ($slash != '')
		return "</$elem>";
	return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols );
}
function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
	$attrarr = array( array( 'name' => 'style', 'value' => '', 'whole' => "name=''", 'vless' => 'style' ) );
	// Go through $attrarr, and save the allowed attributes for this element
	// in $attr2
	$attr2 = '';
	foreach ( $attrarr as $arreach ) {
		if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) {
			$attr2 .= ' '.$arreach['whole'];
		}
	}
	return "<$element$attr2>";
}
function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) {
	$allowed_attr = $allowed_html[strtolower( $element )];
	$name_low = strtolower( $name );
	if ( ! isset( $allowed_attr[$name_low] ) || '' == $allowed_attr[$name_low] ) {
		$name = $value = $whole = '';
		return false;
	}
	if ( 'style' == $name_low ) {
		$new_value = safecss_filter_attr( $value );
		if ( empty( $new_value ) ) {
			$name = $value = $whole = '';
			return false;
		}
		$whole = str_replace( $value, $new_value, $whole );
		$value = $new_value;
	}
	return true;
}
function safecss_filter_attr( $css, $element = 'div' ) {
	$css = $element . ' {' . $css . '}';
	$css = wp_kses_split( $css, array(), array() );
	$old = @setlocale(LC_ALL, 0);
	@setlocale(LC_ALL, 'C');
	preg_match( "/[^\s\r\n\t\f]/", $css{0} );
	@setlocale(LC_ALL, $old);
	return '';
}

$content = '<p style="">hola</p><p style="">hola</p>';
var_dump( wp_kses_split( addslashes( $content ), array('p'=>array('style' => array())), array() ) );