root/tags/1.3/wp-admin/includes/misc.php

<?php

function got_mod_rewrite() {
    global $is_apache;

    // take 3 educated guesses as to whether or not mod_rewrite is available
    if ( !$is_apache )
        return false;

    if ( function_exists( 'apache_get_modules' ) ) {
        if ( !in_array( 'mod_rewrite', apache_get_modules() ) )
            return false;
    }

    return true;
}

// Returns an array of strings from a file (.htaccess ) from between BEGIN
// and END markers.
function extract_from_markers( $filename, $marker ) {
    $result = array ();

    if (!file_exists( $filename ) ) {
        return $result;
    }

    if ( $markerdata = explode( "\n", implode( '', file( $filename ) ) ));
    {
        $state = false;
        foreach ( $markerdata as $markerline ) {
            if (strpos($markerline, '# END ' . $marker) !== false)
                $state = false;
            if ( $state )
                $result[] = $markerline;
            if (strpos($markerline, '# BEGIN ' . $marker) !== false)
                $state = true;
        }
    }

    return $result;
}

// Inserts an array of strings into a file (.htaccess ), placing it between
// BEGIN and END markers.  Replaces existing marked info.  Retains surrounding
// data.  Creates file if none exists.
// Returns true on write success, false on failure.
function insert_with_markers( $filename, $marker, $insertion ) {
    return;
    if (!file_exists( $filename ) || is_writeable( $filename ) ) {
        if (!file_exists( $filename ) ) {
            $markerdata = '';
        } else {
            $markerdata = explode( "\n", implode( '', file( $filename ) ) );
        }

        $f = fopen( $filename, 'w' );
        $foundit = false;
        if ( $markerdata ) {
            $state = true;
            foreach ( $markerdata as $n => $markerline ) {
                if (strpos($markerline, '# BEGIN ' . $marker) !== false)
                    $state = false;
                if ( $state ) {
                    if ( $n + 1 < count( $markerdata ) )
                        fwrite( $f, "{$markerline}\n" );
                    else
                        fwrite( $f, "{$markerline}" );
                }
                if (strpos($markerline, '# END ' . $marker) !== false) {
                    fwrite( $f, "# BEGIN {$marker}\n" );
                    if ( is_array( $insertion ))
                        foreach ( $insertion as $insertline )
                            fwrite( $f, "{$insertline}\n" );
                    fwrite( $f, "# END {$marker}\n" );
                    $state = true;
                    $foundit = true;
                }
            }
        }
        if (!$foundit) {
            fwrite( $f, "# BEGIN {$marker}\n" );
            foreach ( $insertion as $insertline )
                fwrite( $f, "{$insertline}\n" );
            fwrite( $f, "# END {$marker}\n" );
        }
        fclose( $f );
        return true;
    } else {
        return false;
    }
}

/**
 * Updates the htaccess file with the current rules if it is writable.
 *
 * Always writes to the file if it exists and is writable to ensure that we blank out old rules.
 */

function save_mod_rewrite_rules() {
    global $wp_rewrite;

    $home_path = get_home_path();
    $htaccess_file = $home_path.'.htaccess';

    // If the file doesn't already exists check for write access to the directory and whether of not we have some rules.
    // else check for write access to the file.
    if ((!file_exists($htaccess_file) && is_writable($home_path) && $wp_rewrite->using_mod_rewrite_permalinks()) || is_writable($htaccess_file)) {
        if ( got_mod_rewrite() ) {
            $rules = explode( "\n", $wp_rewrite->mod_rewrite_rules() );
            return insert_with_markers( $htaccess_file, 'WordPress', $rules );
        }
    }

    return false;
}

function update_recently_edited( $file ) {
    $oldfiles = (array ) get_option( 'recently_edited' );
    if ( $oldfiles ) {
        $oldfiles = array_reverse( $oldfiles );
        $oldfiles[] = $file;
        $oldfiles = array_reverse( $oldfiles );
        $oldfiles = array_unique( $oldfiles );
        if ( 5 < count( $oldfiles ))
            array_pop( $oldfiles );
    } else {
        $oldfiles[] = $file;
    }
    update_option( 'recently_edited', $oldfiles );
}

// If siteurl or home changed, reset cookies and flush rewrite rules.
function update_home_siteurl( $old_value, $value ) {
    global $wp_rewrite, $user_login, $user_pass_md5;

    if ( defined( "WP_INSTALLING" ) )
        return;

    // If home changed, write rewrite rules to new location.
    $wp_rewrite->flush_rules();
    // Clear cookies for old paths.
    wp_clearcookie();
    // Set cookies for new paths.
    wp_setcookie( $user_login, $user_pass_md5, true, get_option( 'home' ), get_option( 'siteurl' ));
}

add_action( 'update_option_home', 'update_home_siteurl', 10, 2 );
add_action( 'update_option_siteurl', 'update_home_siteurl', 10, 2 );

function url_shorten( $url ) {
    $short_url = str_replace( 'http://', '', stripslashes( $url ));
    $short_url = str_replace( 'www.', '', $short_url );
    if ('/' == substr( $short_url, -1 ))
        $short_url = substr( $short_url, 0, -1 );
    if ( strlen( $short_url ) > 35 )
        $short_url = substr( $short_url, 0, 32 ).'...';
    return $short_url;
}

function wp_reset_vars( $vars ) {
    for ( $i=0; $i<count( $vars ); $i += 1 ) {
        $var = $vars[$i];
        global $$var;

        if (!isset( $$var ) ) {
            if ( empty( $_POST["$var"] ) ) {
                if ( empty( $_GET["$var"] ) )
                    $$var = '';
                else
                    $$var = $_GET["$var"];
            } else {
                $$var = $_POST["$var"];
            }
        }
    }
}

?>