wordpress4.0.1源码学习和摘录--函数

1.根据类型获取当前时间

function current_time( $type, $gmt = 0 ) {
    switch ( $type ) {
        case 'mysql':
            return ( $gmt ) ? gmdate( 'Y-m-d H:i:s' ) : gmdate( 'Y-m-d H:i:s', ( time() + ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ) ) );
        case 'timestamp':
            return ( $gmt ) ? time() : time() + ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
        default:
            return ( $gmt ) ? date( $type ) : date( $type, time() + ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ) );
    }
}

2.转换字节到对应单位

function size_format( $bytes, $decimals = 0 ) {
    $quant = array(
        // ========================= Origin ====
        'TB' => 1099511627776,  // pow( 1024, 4)
        'GB' => 1073741824,     // pow( 1024, 3)
        'MB' => 1048576,        // pow( 1024, 2)
        'kB' => 1024,           // pow( 1024, 1)
        'B ' => 1,              // pow( 1024, 0)
    );
    foreach ( $quant as $unit => $mag )
        if ( doubleval($bytes) >= $mag )
            return number_format_i18n( $bytes / $mag, $decimals ) . ' ' . $unit;

    return false;
}
function number_format_i18n( $number, $decimals = 0 ) {
    global $wp_locale;
    $formatted = number_format( $number, absint( $decimals ), $wp_locale->number_format['decimal_point'], $wp_locale->number_format['thousands_sep'] );

    /**
     * Filter the number formatted based on the locale.
     *
     * @since  2.8.0
     *
     * @param string $formatted Converted number in string format.
     */
    return apply_filters( 'number_format_i18n', $formatted );
}

3.转义引号

function add_magic_quotes( $array ) {
    foreach ( (array) $array as $k => $v ) {
        if ( is_array( $v ) ) {
            $array[$k] = add_magic_quotes( $v );
        } else {
            $array[$k] = addslashes( $v );
        }
    }
    return $array;
}

4.缓存javascript

function cache_javascript_headers() {
    $expiresOffset = 10 * DAY_IN_SECONDS;

    header( "Content-Type: text/javascript; charset=" . get_bloginfo( 'charset' ) );
    header( "Vary: Accept-Encoding" ); // Handle proxies
    header( "Expires: " . gmdate( "D, d M Y H:i:s", time() + $expiresOffset ) . " GMT" );
}

5.创建绝对路径的目录

/**
 * Recursive directory creation based on full path.
 *
 * Will attempt to set permissions on folders.
 *
 * @since 2.0.1
 *
 * @param string $target Full path to attempt to create.
 * @return bool Whether the path was created. True if path already exists.
 */
function wp_mkdir_p( $target ) {
    $wrapper = null;

    // Strip the protocol.
    if( wp_is_stream( $target ) ) {
        list( $wrapper, $target ) = explode( '://', $target, 2 );
    }

    // From php.net/mkdir user contributed notes.
    $target = str_replace( '//', '/', $target );

    // Put the wrapper back on the target.
    if( $wrapper !== null ) {
        $target = $wrapper . '://' . $target;
    }

    /*
     * Safe mode fails with a trailing slash under certain PHP versions.
     * Use rtrim() instead of untrailingslashit to avoid formatting.php dependency.
     */
    $target = rtrim($target, '/');
    if ( empty($target) )
        $target = '/';

    if ( file_exists( $target ) )
        return @is_dir( $target );

    // We need to find the permissions of the parent folder that exists and inherit that.
    $target_parent = dirname( $target );
    while ( '.' != $target_parent && ! is_dir( $target_parent ) ) {
        $target_parent = dirname( $target_parent );
    }

    // Get the permission bits.
    if ( $stat = @stat( $target_parent ) ) {
        $dir_perms = $stat['mode'] & 0007777;
    } else {
        $dir_perms = 0777;
    }

    if ( @mkdir( $target, $dir_perms, true ) ) {

        /*
         * If a umask is set that modifies $dir_perms, we'll have to re-set
         * the $dir_perms correctly with chmod()
         */
        if ( $dir_perms != ( $dir_perms & ~umask() ) ) {
            $folder_parts = explode( '/', substr( $target, strlen( $target_parent ) + 1 ) );
            for ( $i = 1; $i <= count( $folder_parts ); $i++ ) {
                @chmod( $target_parent . '/' . implode( '/', array_slice( $folder_parts, 0, $i ) ), $dir_perms );
            }
        }

        return true;
    }

    return false;
}

6.创建唯一的文件名

/**
 * Get a filename that is sanitized and unique for the given directory.
 *
 * If the filename is not unique, then a number will be added to the filename
 * before the extension, and will continue adding numbers until the filename is
 * unique.
 *
 * The callback is passed three parameters, the first one is the directory, the
 * second is the filename, and the third is the extension.
 *
 * @since 2.5.0
 *
 * @param string   $dir                      Directory.
 * @param string   $filename                 File name.
 * @param callback $unique_filename_callback Callback. Default null.
 * @return string New filename, if given wasn't unique.
 */
function wp_unique_filename( $dir, $filename, $unique_filename_callback = null ) {
    // Sanitize the file name before we begin processing.
    //$filename = sanitize_file_name($filename);

    // Separate the filename into a name and extension.
    $info = pathinfo($filename);
    $ext = !empty($info['extension']) ? '.' . $info['extension'] : '';
    $name = basename($filename, $ext);

    // Edge case: if file is named '.ext', treat as an empty name.
    if ( $name === $ext )
        $name = '';

    /*
     * Increment the file number until we have a unique file to save in $dir.
     * Use callback if supplied.
     */
    if ( $unique_filename_callback && is_callable( $unique_filename_callback ) ) {
        $filename = call_user_func( $unique_filename_callback, $dir, $name, $ext );
    } else {
        $number = '';

        // Change '.ext' to lower case.
        if ( $ext && strtolower($ext) != $ext ) {
            $ext2 = strtolower($ext);
            $filename2 = preg_replace( '|' . preg_quote($ext) . '$|', $ext2, $filename );

            // Check for both lower and upper case extension or image sub-sizes may be overwritten.
            while ( file_exists($dir . "/$filename") || file_exists($dir . "/$filename2") ) {
                $new_number = $number + 1;
                $filename = str_replace( "$number$ext", "$new_number$ext", $filename );
                $filename2 = str_replace( "$number$ext2", "$new_number$ext2", $filename2 );
                $number = $new_number;
            }
            return $filename2;
        }

        while ( file_exists( $dir . "/$filename" ) ) {
            if ( '' == "$number$ext" )
                $filename = $filename . ++$number . $ext;
            else
                $filename = str_replace( "$number$ext", ++$number . $ext, $filename );
        }
    }

    return $filename;
}

读到L2035==>待续