Php CodeIgniter资源目录字符串帮助程序

我正在使用CodeIgniter 3.1.7，自动加载并启用url帮助程序

如何编写利用基本url的assets\u helper.php；解析https://something.tld/ 并将第一个组作为子文件夹如果没有组，它将使用基本资源文件夹

从

我知道只需编写就可以实现这一点，但很难维护，比如说，如果下次我计划将资产文件夹更改为/subfolder/1/2/3/assets/。我可以只更改helper文件中的1个变量，而不影响原始源代码。

如果创建asset\u helper.php，则需要自动加载它。在codeigniter中，您可以向现有助手添加新函数。由于url\u助手已经自动加载并准备好使用，我将向url\u助手添加新函数

在application/helpers目录中创建一个新文件MY_url_helper.php。 复制并粘贴下面的代码

<?php
function assets_url($dir,$file=null){
    $assets_dir = base_url()."path/to/your/assets_folder/";
    $asset_path = $assets_dir.$dir;
    if(!empty($file)){
        $asset_path .="/$file";
    }
    return $asset_path;
}

---

将/path/to/your/assets\u folder/替换为末尾的资产文件夹“/”非常重要

你可能会发现我写的这个模型很有用，需要修改

$this->asset->load'item'

如果项目位于$this->assets数组中，则将从该数组中加载该项目。 否则，您必须传递url或名称：$this->asset->load'item.js'

您还可以传递数组$this->asset->loadarray'item1.js'、'item2.css'

它将使用CI中的link_tag函数和自定义脚本_tag函数，并返回包含适当js/css和标记的字符串

将需要对常量资产_DIR、ROOT进行一些修改和定义。但功能是存在的

class Asset_loader_model extends CI_Model {

    private $types = array('css', 'js');
    private $assets = array();

    public function __construct() {

        parent::__construct();
        $this->assets = $this->n_config->get('plugin_assets');
    }

    /**
     * Loads an asset or assets by key
     * 
     * @param string $asset
     * @param boolean $return Default to false
     */
    public function load($asset, $return = false) {
        $out = '';
        if (is_array($asset)) {
            foreach ($asset as $src) {
                $out .= $this->load($src, true);
            }
        } else {
            if (isset($this->assets[$asset])) {
                // asset is in the plugins array
                $out .= $this->__load($this->assets[$asset]);
            } elseif (is_file(ROOT . ASSETS_DIR . $asset)) {
                // asset must be a /js/include.js
                $out .= $this->__load($asset);
            } else {
                trigger_error("Could not find asset {$asset}.", E_USER_WARNING);
            }
        }
        if ($return) {
            return $out;
        } else {
            echo $out;
        }
    }

    /**
     * Loads a single asset array by key
     * 
     * @param key $asset
     * @return string
     */
    private function __load($asset) {
        $out = '';
        if (is_array($asset)) {
            foreach ($asset as $type => $srcs) {
                if (!in_array($type, $this->types)) {
                    continue;
                }
                if (is_array($srcs)) {
                    foreach ($srcs as $src) {
                        $out .= $this->load_individual($src, $type);
                    }
                } else {
                    $out .= $this->load_individual($srcs, $type);
                }
            }
        } else {
            $type = $this->get_type($asset);
            if (in_array($type, $this->types)) {
                $out .= $this->load_individual($asset, $type);
            }
        }
        return $out;
    }

    /**
     * Gets type based on extension
     * 
     * @param string $src
     * @return string $type
     */
    public function get_type($src) {
        return pathinfo($src, PATHINFO_EXTENSION);
    }

    /**
     * Outputs src in proper html tag
     * 
     * @param string $src
     * @param string $type
     */
    private function load_individual($src, $type) {
        if (!is_http($src)) {
            $src = base_url(ASSETS_DIR . $src);
        }
        switch ($type) {
            case 'js':
                return script_tag($src);
                break;
            case 'css':
                return link_tag($src);
                break;
        }
    }

}

资产管理辅助工具：

if (!function_exists('script_tag')) {

    /**
     * Script
     *
     * Generates link to a JS file
     *
     * @param mixed $src Script source or an array
     * @param bool $index_page Should index_page be added to the js path
     * @return string
     */
    function script_tag($src = '', $index_page = false) {
        $CI = & get_instance();
        $script = '<script ';
        if (is_array($src)) {
            foreach ($src as $k => $v) {
                if ($k === 'src' && !preg_match('#^([a-z]+:)?//#i', $v)) {
                    if ($index_page === true) {
                        $script .= 'src="' . $CI->config->site_url($v) . '"';
                    } else {
                        $script .= 'src="' . $CI->config->slash_item('base_url') . $v . '"';
                    }
                } else {
                    $script .= $k . '="' . $v . '" ';
                }
            }
        } else {
            if (preg_match('#^([a-z]+:)?//#i', $src)) {
                $script .= 'src="' . $src . '"';
            } elseif ($index_page === true) {
                $script .= 'src="' . $CI->config->site_url($src) . '"';
            } else {
                $script .= 'src="' . $CI->config->slash_item('base_url') . $src . '"';
            }
        }
        return $script . ' type="text/javascript"' . "></script>";
        //return $script . '></script>'; // w3c no need for type
    }

}

/**
 * Checks if a string contains a url
 * 
 * @param string $str
 * @return boolean
 */
function is_http($str) {
    return preg_match("/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/", $str);
}

class Asset_loader_model extends CI_Model {

    private $types = array('css', 'js');
    private $assets = array();

    public function __construct() {

        parent::__construct();
        $this->assets = $this->n_config->get('plugin_assets');
    }

    /**
     * Loads an asset or assets by key
     * 
     * @param string $asset
     * @param boolean $return Default to false
     */
    public function load($asset, $return = false) {
        $out = '';
        if (is_array($asset)) {
            foreach ($asset as $src) {
                $out .= $this->load($src, true);
            }
        } else {
            if (isset($this->assets[$asset])) {
                // asset is in the plugins array
                $out .= $this->__load($this->assets[$asset]);
            } elseif (is_file(ROOT . ASSETS_DIR . $asset)) {
                // asset must be a /js/include.js
                $out .= $this->__load($asset);
            } else {
                trigger_error("Could not find asset {$asset}.", E_USER_WARNING);
            }
        }
        if ($return) {
            return $out;
        } else {
            echo $out;
        }
    }

    /**
     * Loads a single asset array by key
     * 
     * @param key $asset
     * @return string
     */
    private function __load($asset) {
        $out = '';
        if (is_array($asset)) {
            foreach ($asset as $type => $srcs) {
                if (!in_array($type, $this->types)) {
                    continue;
                }
                if (is_array($srcs)) {
                    foreach ($srcs as $src) {
                        $out .= $this->load_individual($src, $type);
                    }
                } else {
                    $out .= $this->load_individual($srcs, $type);
                }
            }
        } else {
            $type = $this->get_type($asset);
            if (in_array($type, $this->types)) {
                $out .= $this->load_individual($asset, $type);
            }
        }
        return $out;
    }

    /**
     * Gets type based on extension
     * 
     * @param string $src
     * @return string $type
     */
    public function get_type($src) {
        return pathinfo($src, PATHINFO_EXTENSION);
    }

    /**
     * Outputs src in proper html tag
     * 
     * @param string $src
     * @param string $type
     */
    private function load_individual($src, $type) {
        if (!is_http($src)) {
            $src = base_url(ASSETS_DIR . $src);
        }
        switch ($type) {
            case 'js':
                return script_tag($src);
                break;
            case 'css':
                return link_tag($src);
                break;
        }
    }

}

if (!function_exists('script_tag')) {

    /**
     * Script
     *
     * Generates link to a JS file
     *
     * @param mixed $src Script source or an array
     * @param bool $index_page Should index_page be added to the js path
     * @return string
     */
    function script_tag($src = '', $index_page = false) {
        $CI = & get_instance();
        $script = '<script ';
        if (is_array($src)) {
            foreach ($src as $k => $v) {
                if ($k === 'src' && !preg_match('#^([a-z]+:)?//#i', $v)) {
                    if ($index_page === true) {
                        $script .= 'src="' . $CI->config->site_url($v) . '"';
                    } else {
                        $script .= 'src="' . $CI->config->slash_item('base_url') . $v . '"';
                    }
                } else {
                    $script .= $k . '="' . $v . '" ';
                }
            }
        } else {
            if (preg_match('#^([a-z]+:)?//#i', $src)) {
                $script .= 'src="' . $src . '"';
            } elseif ($index_page === true) {
                $script .= 'src="' . $CI->config->site_url($src) . '"';
            } else {
                $script .= 'src="' . $CI->config->slash_item('base_url') . $src . '"';
            }
        }
        return $script . ' type="text/javascript"' . "></script>";
        //return $script . '></script>'; // w3c no need for type
    }

}

/**
 * Checks if a string contains a url
 * 
 * @param string $str
 * @return boolean
 */
function is_http($str) {
    return preg_match("/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/", $str);
}