Code to detect uploaded file type and uploaded image size in PHP_PHP Tutorial

There are two examples in the article that are used to detect the uploaded file type and uploaded image size. I originally wanted to write them separately but thought it would be better to put them together. Students in need can take a look.

The code is as follows

代码如下

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//----------------------------------------------------------------------------------- // 函数名：CheckExtendName($C_filename,$A_extend) // 作 用：上传文件的扩展名判断 // 参 数：$C_filename 上传的文件名 // $A_extend 要求的扩展名 // 返回值：布尔值 // 备 注：无 //-----------------------------------------------------------------------------------     function CheckExtendName($C_filename,$A_extend) { if(strlen(trim($C_filename)) < 5) { return 0; //返回0表示没上传图片 } $lastdot = strrpos($C_filename, "."); //取出.最后出现的位置 $extended = substr($C_filename, $lastdot+1); //取出扩展名 for($i=0;$i{ if (trim(strtolower($extended)) == trim(strtolower($A_extend[$i]))) //转换大 小写并检测 { $flag=1; //加成功标志 $i=count($A_extend); //检测到了便停止检测 } } if($flag<>1) { for($j=0;$j{ $alarm .= $A_extend[$j]." "; } AlertExit('只能上传'.$alarm.'文件！而你上传的是'.$extended.'类型的文件'); return -1; //返回-1表示上传图片的类型不符 }     return 1; //返回1表示图片的类型符合要求 }       //-----------------------------------------------------------------------------------       // 函数名：CheckImageSize($ImageFileName,$LimitSize) // 作 用：检验上传图片的大小 // 参 数：$ImageFileName 上传的图片名 // $LimitSize 要求的尺寸 // 返回值：布尔值 // 备 注：无 //-----------------------------------------------------------------------------------     function CheckImageSize($ImageFileName,$LimitSize) { $size=GetImageSize($ImageFileName); if ($size[0]>$LimitSize[0] ││ $size[1]>$LimitSize[1]) { AlertExit('图片尺寸过大'); return false; } return true; }       //-----------------------------------------------------------------------------------       // 函数名：Alert($C_alert,$I_goback=0) // 作 用：非法操作警告 // 参 数：$C_alert（提示的错误信息） // $I_goback（返回到那一页） // 返回值：字符串 // 备 注：无 //-----------------------------------------------------------------------------------     function Alert($C_alert,$I_goback=0) { if($I_goback<>0) { echo " "; } else { echo " "; } } ?>

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// Function name: CheckExtendName($C_filename,$A_extend)// Function: Determine the extension of the uploaded file// Parameter: $C_filename Uploaded file name // $A_extend required extension // Return value: Boolean value // Remarks: None //---- -------------------------------------------------- --------------------------

function CheckExtendName( $C_filename,$A_extend){if(strlen(trim($C_filename)) < 5){return 0; / /Return 0 means no picture has been uploaded}$lastdot = strrpos($C_filename, "."); //Get the last appearing position$extended = substr($C_filename, $lastdot+1); //Get the extension for($i=0;$i{ if (trim(strtolower($extended)) == trim(strtolower($A_extend[$i]))) //Convert uppercase to lowercase and detect {$flag=1; //Add success flag$i=count($A_extend); //Stop detection if detected}} if($flag<>1){for($j=0;$j{ $alarm .= $A_extend[$j]." ";}AlertExit('Only '.$alarm.' files can be uploaded! And what you uploaded is a file of type '.$extended.');return -1; //Returning -1 means that the type of the uploaded image does not match } return 1; //Returning 1 means that the type of image meets the requirements } //----------------------------------------- ------------------------------------------ // Function name: CheckImageSize($ImageFileName,$LimitSize)// Function: Check the size of the uploaded image // Parameters: $ImageFileName Uploaded image name// $LimitSize Required size// Return value: Boolean value// Remarks: None //--------------------------------------------- ------------------------------------- function CheckImageSize($ImageFileName,$LimitSize){$size=GetImageSize($ImageFileName);if ($size[0] >$LimitSize[0] ││ $size[1]>$LimitSize[1]){AlertExit('Picture size is too large');return false;}return true;} //-------------------------------------------------- ------------------------------------ // Function name: Alert($C_alert,$I_goback=0)// Function: Illegal operation warning// Parameter: $C_alert (Error message prompted) // $I_goback (return to that page) // Return value: String // Remarks: None //--------------------------------------------- ------------------------------------- function Alert($C_alert,$I_goback=0){if($I_goback<>0){echo " ";}else{echo " ";} }?> http://www.bkjia.com/PHPjc/444713.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/444713.htmlTechArticleThe article has two examples that are used to detect the uploaded file type and uploaded image size. I originally wanted to write them separately but felt that It would be better to put the two together. Students in need should take a look. The code is as follows...