Detailed explanation of ThinkPHP built-in functions D, F, S, C, L, A, I

Single-letter functions D, F, S, C, L, A, and I are all defined in the file ThinkPHP/Mode/Api/functions.php in the core of ThinkPHP.

Below I will explain their functions respectively:

D() loads the Model class

M() loads the Model class

A() loads the Action class

L() gets the language definition

C() obtains the configuration value. The usage is C("Fill in the subscript of the array in the configuration file here")

S() Global Cache Configuration Usage S ("This is equivalent to a unique identifier")

F() fast file data reading and saving for simple type data strings, arrays

I() quickly creates an object instance

Attached here: ThinkPHP built-in prototype definitions for all functions

<span> 1</span> <span>php </span><span> 2</span> <span> 3</span> <span>/*</span><span>* </span><span> 4</span> <span> * Think API模式函数库 </span><span> 5</span> <span>*/</span> <span> 6</span> <span> 7</span> <span>/*</span><span>* </span><span> 8</span> <span> * 获取和设置配置参数 支持批量定义 </span><span> 9</span> <span> * @param string|array $name 配置变量 </span><span> 10</span> <span> * @param mixed $value 配置值 </span><span> 11</span> <span> * @param mixed $default 默认值 </span><span> 12</span> <span> * @return mixed </span><span> 13</span> <span>*/</span> <span> 14</span> <span>function</span> C(<span>$name</span>=<span>null</span>, <span>$value</span>=<span>null</span>,<span>$default</span>=<span>null</span><span>) {} </span><span> 15</span> <span> 16</span> <span>/*</span><span>* </span><span> 17</span> <span> * 加载配置文件 支持格式转换 仅支持一级配置 </span><span> 18</span> <span> * @param string $file 配置文件名 </span><span> 19</span> <span> * @param string $parse 配置解析方法 有些格式需要用户自己解析 </span><span> 20</span> <span> * @return void </span><span> 21</span> <span>*/</span> <span> 22</span> <span>function</span> load_config(<span>$file</span>,<span>$parse</span>=<span>CONF_PARSE) {} </span><span> 23</span> <span> 24</span> <span>/*</span><span>* </span><span> 25</span> <span> * 抛出异常处理 </span><span> 26</span> <span> * @param string $msg 异常消息 </span><span> 27</span> <span> * @param integer $code 异常代码 默认为0 </span><span> 28</span> <span> * @return void </span><span> 29</span> <span>*/</span> <span> 30</span> <span>function</span> E(<span>$msg</span>, <span>$code</span>=0<span>) {} </span><span> 31</span> <span> 32</span> <span>/*</span><span>* </span><span> 33</span> <span> * 记录和统计时间（微秒）和内存使用情况 </span><span> 34</span> <span> * 使用方法: </span><span> 35</span> <span> * <code> </code></span><span> 36</span> <span> * G('begin'); // 记录开始标记位 </span><span> 37</span> <span> * // ... 区间运行代码 </span><span> 38</span> <span> * G('end'); // 记录结束标签位 </span><span> 39</span> <span> * echo G('begin','end',6); // 统计区间运行时间 精确到小数后6位 </span><span> 40</span> <span> * echo G('begin','end','m'); // 统计区间内存使用情况 </span><span> 41</span> <span> * 如果end标记位没有定义，则会自动以当前作为标记位 </span><span> 42</span> <span> * 其中统计内存使用需要 MEMORY_LIMIT_ON 常量为true才有效 </span><span> 43</span> <span> *  </span><span> 44</span> <span> * @param string $start 开始标签 </span><span> 45</span> <span> * @param string $end 结束标签 </span><span> 46</span> <span> * @param integer|string $dec 小数位或者m </span><span> 47</span> <span> * @return mixed </span><span> 48</span> <span>*/</span> <span> 49</span> <span>function</span> G(<span>$start</span>,<span>$end</span>='',<span>$dec</span>=4<span>) {} </span><span> 50</span> <span> 51</span> <span>/*</span><span>* </span><span> 52</span> <span> * 获取和设置语言定义(不区分大小写) </span><span> 53</span> <span> * @param string|array $name 语言变量 </span><span> 54</span> <span> * @param string $value 语言值 </span><span> 55</span> <span> * @return mixed </span><span> 56</span> <span>*/</span> <span> 57</span> <span>function</span> L(<span>$name</span>=<span>null</span>, <span>$value</span>=<span>null</span><span>) {} </span><span> 58</span> <span> 59</span> <span>/*</span><span>* </span><span> 60</span> <span> * 添加和获取页面Trace记录 </span><span> 61</span> <span> * @param string $value 变量 </span><span> 62</span> <span> * @param string $label 标签 </span><span> 63</span> <span> * @param string $level 日志级别 </span><span> 64</span> <span> * @param boolean $record 是否记录日志 </span><span> 65</span> <span> * @return void </span><span> 66</span> <span>*/</span> <span> 67</span> <span>function</span> trace(<span>$value</span>='[think]',<span>$label</span>='',<span>$level</span>='DEBUG',<span>$record</span>=<span>false</span><span>) {} </span><span> 68</span> <span> 69</span> <span>/*</span><span>* </span><span> 70</span> <span> * 编译文件 </span><span> 71</span> <span> * @param string $filename 文件名 </span><span> 72</span> <span> * @return string </span><span> 73</span> <span>*/</span> <span> 74</span> <span>function</span> compile(<span>$filename</span><span>) {} </span><span> 75</span> <span> 76</span> <span>/*</span><span>* </span><span> 77</span> <span> * 获取输入参数 支持过滤和默认值 </span><span> 78</span> <span> * 使用方法: </span><span> 79</span> <span> * <code> </code></span><span> 80</span> <span> * I('id',0); 获取id参数 自动判断get或者post </span><span> 81</span> <span> * I('post.name','','htmlspecialchars'); 获取$_POST['name'] </span><span> 82</span> <span> * I('get.'); 获取$_GET </span><span> 83</span> <span> *  </span><span> 84</span> <span> * @param string $name 变量的名称 支持指定类型 </span><span> 85</span> <span> * @param mixed $default 不存在的时候默认值 </span><span> 86</span> <span> * @param mixed $filter 参数过滤方法 </span><span> 87</span> <span> * @return mixed </span><span> 88</span> <span>*/</span> <span> 89</span> <span>function</span> I(<span>$name</span>,<span>$default</span>='',<span>$filter</span>=<span>null</span><span>) {} </span><span> 90</span> <span> 91</span> <span>/*</span><span>* </span><span> 92</span> <span> * 设置和获取统计数据 </span><span> 93</span> <span> * 使用方法: </span><span> 94</span> <span> * <code> </code></span><span> 95</span> <span> * N('db',1); // 记录数据库操作次数 </span><span> 96</span> <span> * N('read',1); // 记录读取次数 </span><span> 97</span> <span> * echo N('db'); // 获取当前页面数据库的所有操作次数 </span><span> 98</span> <span> * echo N('read'); // 获取当前页面读取次数 </span><span> 99</span> <span> *  </span><span>100</span> <span> * @param string $key 标识位置 </span><span>101</span> <span> * @param integer $step 步进值 </span><span>102</span> <span> * @return mixed </span><span>103</span> <span>*/</span> <span>104</span> <span>function</span> N(<span>$key</span>, <span>$step</span>=0,<span>$save</span>=<span>false</span><span>) {} </span><span>105</span> <span>106</span> <span>/*</span><span>* </span><span>107</span> <span> * 字符串命名风格转换 </span><span>108</span> <span> * type 0 将Java风格转换为C的风格 1 将C风格转换为Java的风格 </span><span>109</span> <span> * @param string $name 字符串 </span><span>110</span> <span> * @param integer $type 转换类型 </span><span>111</span> <span> * @return string </span><span>112</span> <span>*/</span> <span>113</span> <span>function</span> parse_name(<span>$name</span>, <span>$type</span>=0<span>) {} </span><span>114</span> <span>115</span> <span>/*</span><span>* </span><span>116</span> <span> * 优化的require_once </span><span>117</span> <span> * @param string $filename 文件地址 </span><span>118</span> <span> * @return boolean </span><span>119</span> <span>*/</span> <span>120</span> <span>function</span> require_cache(<span>$filename</span><span>) {} </span><span>121</span> <span>122</span> <span>/*</span><span>* </span><span>123</span> <span> * 区分大小写的文件存在判断 </span><span>124</span> <span> * @param string $filename 文件地址 </span><span>125</span> <span> * @return boolean </span><span>126</span> <span>*/</span> <span>127</span> <span>function</span> file_exists_case(<span>$filename</span><span>) {} </span><span>128</span> <span>129</span> <span>/*</span><span>* </span><span>130</span> <span> * 导入所需的类库 同java的Import 本函数有缓存功能 </span><span>131</span> <span> * @param string $class 类库命名空间字符串 </span><span>132</span> <span> * @param string $baseUrl 起始路径 </span><span>133</span> <span> * @param string $ext 导入的文件扩展名 </span><span>134</span> <span> * @return boolean </span><span>135</span> <span>*/</span> <span>136</span> <span>function</span> import(<span>$class</span>, <span>$baseUrl</span> = '', <span>$ext</span>=<span>EXT) {} </span><span>137</span> <span>138</span> <span>/*</span><span>* </span><span>139</span> <span> * 基于命名空间方式导入函数库 </span><span>140</span> <span> * load('@.Util.Array') </span><span>141</span> <span> * @param string $name 函数库命名空间字符串 </span><span>142</span> <span> * @param string $baseUrl 起始路径 </span><span>143</span> <span> * @param string $ext 导入的文件扩展名 </span><span>144</span> <span> * @return void </span><span>145</span> <span>*/</span> <span>146</span> <span>function</span> load(<span>$name</span>, <span>$baseUrl</span>='', <span>$ext</span>='.php'<span>) {} </span><span>147</span> <span>148</span> <span>/*</span><span>* </span><span>149</span> <span> * 快速导入第三方框架类库 所有第三方框架的类库文件统一放到 系统的Vendor目录下面 </span><span>150</span> <span> * @param string $class 类库 </span><span>151</span> <span> * @param string $baseUrl 基础目录 </span><span>152</span> <span> * @param string $ext 类库后缀 </span><span>153</span> <span> * @return boolean </span><span>154</span> <span>*/</span> <span>155</span> <span>function</span> vendor(<span>$class</span>, <span>$baseUrl</span> = '', <span>$ext</span>='.php'<span>) {} </span><span>156</span> <span>157</span> <span>/*</span><span>* </span><span>158</span> <span> * D函数用于实例化模型类 格式 [资源://][模块/]模型 </span><span>159</span> <span> * @param string $name 资源地址 </span><span>160</span> <span> * @param string $layer 模型层名称 </span><span>161</span> <span> * @return Model </span><span>162</span> <span>*/</span> <span>163</span> <span>function</span> D(<span>$name</span>='',<span>$layer</span>=''<span>) {} </span><span>164</span> <span>165</span> <span>/*</span><span>* </span><span>166</span> <span> * M函数用于实例化一个没有模型文件的Model </span><span>167</span> <span> * @param string $name Model名称 支持指定基础模型 例如 MongoModel:User </span><span>168</span> <span> * @param string $tablePrefix 表前缀 </span><span>169</span> <span> * @param mixed $connection 数据库连接信息 </span><span>170</span> <span> * @return Model </span><span>171</span> <span>*/</span> <span>172</span> <span>function</span> M(<span>$name</span>='', <span>$tablePrefix</span>='',<span>$connection</span>=''<span>) {} </span><span>173</span> <span>174</span> <span>/*</span><span>* </span><span>175</span> <span> * 解析资源地址并导入类库文件 </span><span>176</span> <span> * 例如 module/controller addon://module/behavior </span><span>177</span> <span> * @param string $name 资源地址 格式：[扩展://][模块/]资源名 </span><span>178</span> <span> * @param string $layer 分层名称 </span><span>179</span> <span> * @return string </span><span>180</span> <span>*/</span> <span>181</span> <span>function</span> parse_res_name(<span>$name</span>,<span>$layer</span>,<span>$level</span>=1<span>) {} </span><span>182</span> <span>183</span> <span>/*</span><span>* </span><span>184</span> <span> * A函数用于实例化控制器 格式：[资源://][模块/]控制器 </span><span>185</span> <span> * @param string $name 资源地址 </span><span>186</span> <span> * @param string $layer 控制层名称 </span><span>187</span> <span> * @param integer $level 控制器层次 </span><span>188</span> <span> * @return Controller|false </span><span>189</span> <span>*/</span> <span>190</span> <span>function</span> A(<span>$name</span>,<span>$layer</span>='',<span>$level</span>=''<span>) {} </span><span>191</span> <span>192</span> <span>/*</span><span>* </span><span>193</span> <span> * 远程调用控制器的操作方法 URL 参数格式 [资源://][模块/]控制器/操作 </span><span>194</span> <span> * @param string $url 调用地址 </span><span>195</span> <span> * @param string|array $vars 调用参数 支持字符串和数组 </span><span>196</span> <span> * @param string $layer 要调用的控制层名称 </span><span>197</span> <span> * @return mixed </span><span>198</span> <span>*/</span> <span>199</span> <span>function</span> R(<span>$url</span>,<span>$vars</span>=<span>array</span>(),<span>$layer</span>=''<span>) {} </span><span>200</span> <span>201</span> <span>/*</span><span>* </span><span>202</span> <span> * 执行某个行为 </span><span>203</span> <span> * @param string $name 行为名称 </span><span>204</span> <span> * @param Mixed $params 传入的参数 </span><span>205</span> <span> * @return void </span><span>206</span> <span>*/</span> <span>207</span> <span>function</span> B(<span>$name</span>, &<span>$params</span>=<span>NULL</span><span>) {} </span><span>208</span> <span>209</span> <span>/*</span><span>* </span><span>210</span> <span> * 去除代码中的空白和注释 </span><span>211</span> <span> * @param string $content 代码内容 </span><span>212</span> <span> * @return string </span><span>213</span> <span>*/</span> <span>214</span> <span>function</span> strip_whitespace(<span>$content</span><span>) {} </span><span>215</span> <span>216</span> <span>/*</span><span>* </span><span>217</span> <span> * 浏览器友好的变量输出 </span><span>218</span> <span> * @param mixed $var 变量 </span><span>219</span> <span> * @param boolean $echo 是否输出 默认为True 如果为false 则返回输出字符串 </span><span>220</span> <span> * @param string $label 标签 默认为空 </span><span>221</span> <span> * @param boolean $strict 是否严谨 默认为true </span><span>222</span> <span> * @return void|string </span><span>223</span> <span>*/</span> <span>224</span> <span>function</span> dump(<span>$var</span>, <span>$echo</span>=<span>true</span>, <span>$label</span>=<span>null</span>, <span>$strict</span>=<span>true</span><span>) {} </span><span>225</span> <span>226</span> <span>/*</span><span>* </span><span>227</span> <span> * URL重定向 </span><span>228</span> <span> * @param string $url 重定向的URL地址 </span><span>229</span> <span> * @param integer $time 重定向的等待时间（秒） </span><span>230</span> <span> * @param string $msg 重定向前的提示信息 </span><span>231</span> <span> * @return void </span><span>232</span> <span>*/</span> <span>233</span> <span>function</span> redirect(<span>$url</span>, <span>$time</span>=0, <span>$msg</span>=''<span>) {} </span><span>234</span> <span>235</span> <span>/*</span><span>* </span><span>236</span> <span> * 缓存管理 </span><span>237</span> <span> * @param mixed $name 缓存名称，如果为数组表示进行缓存设置 </span><span>238</span> <span> * @param mixed $value 缓存值 </span><span>239</span> <span> * @param mixed $options 缓存参数 </span><span>240</span> <span> * @return mixed </span><span>241</span> <span>*/</span> <span>242</span> <span>function</span> S(<span>$name</span>,<span>$value</span>='',<span>$options</span>=<span>null</span><span>) {} </span><span>243</span> <span>244</span> <span>/*</span><span>* </span><span>245</span> <span> * 快速文件数据读取和保存 针对简单类型数据 字符串、数组 </span><span>246</span> <span> * @param string $name 缓存名称 </span><span>247</span> <span> * @param mixed $value 缓存值 </span><span>248</span> <span> * @param string $path 缓存路径 </span><span>249</span> <span> * @return mixed </span><span>250</span> <span>*/</span> <span>251</span> <span>function</span> F(<span>$name</span>, <span>$value</span>='', <span>$path</span>=<span>DATA_PATH) {} </span><span>252</span> <span>253</span> <span>/*</span><span>* </span><span>254</span> <span> * 根据PHP各种类型变量生成唯一标识号 </span><span>255</span> <span> * @param mixed $mix 变量 </span><span>256</span> <span> * @return string </span><span>257</span> <span>*/</span> <span>258</span> <span>function</span> to_guid_string(<span>$mix</span><span>) {} </span><span>259</span> <span>260</span> <span>/*</span><span>* </span><span>261</span> <span> * XML编码 </span><span>262</span> <span> * @param mixed $data 数据 </span><span>263</span> <span> * @param string $root 根节点名 </span><span>264</span> <span> * @param string $item 数字索引的子节点名 </span><span>265</span> <span> * @param string $attr 根节点属性 </span><span>266</span> <span> * @param string $id   数字索引子节点key转换的属性名 </span><span>267</span> <span> * @param string $encoding 数据编码 </span><span>268</span> <span> * @return string </span><span>269</span> <span>*/</span> <span>270</span> <span>function</span> xml_encode(<span>$data</span>, <span>$root</span>='think', <span>$item</span>='item', <span>$attr</span>='', <span>$id</span>='id', <span>$encoding</span>='utf-8'<span>) {} </span><span>271</span> <span>272</span> <span>/*</span><span>* </span><span>273</span> <span> * 数据XML编码 </span><span>274</span> <span> * @param mixed  $data 数据 </span><span>275</span> <span> * @param string $item 数字索引时的节点名称 </span><span>276</span> <span> * @param string $id   数字索引key转换为的属性名 </span><span>277</span> <span> * @return string </span><span>278</span> <span>*/</span> <span>279</span> <span>function</span> data_to_xml(<span>$data</span>, <span>$item</span>='item', <span>$id</span>='id'<span>) {} </span><span>280</span> <span>281</span> <span>/*</span><span>* </span><span>282</span> <span> * session管理函数 </span><span>283</span> <span> * @param string|array $name session名称 如果为数组则表示进行session设置 </span><span>284</span> <span> * @param mixed $value session值 </span><span>285</span> <span> * @return mixed </span><span>286</span> <span>*/</span> <span>287</span> <span>function</span> session(<span>$name</span>,<span>$value</span>=''<span>) {} </span><span>288</span> <span>/*</span><span>* </span><span>289</span> <span> * Cookie 设置、获取、删除 </span><span>290</span> <span> * @param string $name cookie名称 </span><span>291</span> <span> * @param mixed $value cookie值 </span><span>292</span> <span> * @param mixed $options cookie参数 </span><span>293</span> <span> * @return mixed </span><span>294</span> <span>*/</span> <span>295</span> <span>function</span> cookie(<span>$name</span>, <span>$value</span>='', <span>$option</span>=<span>null</span><span>) {} </span><span>296</span> <span>297</span> <span>/*</span><span>* </span><span>298</span> <span> * 加载动态扩展文件 </span><span>299</span> <span> * @return void </span><span>300</span> <span>*/</span> <span>301</span> <span>function</span> load_ext_file(<span>$path</span><span>) {} </span><span>302</span> <span>/*</span><span>* </span><span>303</span> <span> * 获取客户端IP地址 </span><span>304</span> <span> * @param integer $type 返回类型 0 返回IP地址 1 返回IPV4地址数字 </span><span>305</span> <span> * @return mixed </span><span>306</span> <span>*/</span> <span>307</span> <span>function</span> get_client_ip(<span>$type</span> = 0<span>) {} </span><span>308</span> <span>309</span> <span>/*</span><span>* </span><span>310</span> <span> * 发送HTTP状态 </span><span>311</span> <span> * @param integer $code 状态码 </span><span>312</span> <span> * @return void </span><span>313</span> <span>*/</span> <span>314</span> <span>function</span> send_http_status(<span>$code</span><span>) {} </span><span>315</span> <span>316</span> <span>//</span><span> 过滤表单中的表达式</span> <span>317</span> <span>function</span> filter_exp(&<span>$value</span><span>) {} </span><span>318</span> <span>319</span> <span>//</span><span> 不区分大小写的in_array实现</span> <span>320</span> <span>function</span> in_array_case(<span>$value</span>,<span>$array</span>) {}

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The above introduces the detailed explanation of ThinkPHP's built-in functions D, F, S, C, L, A, and I, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.