Презентация РНР hypertext preprocessor language онлайн
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- Тип файла:ppt / pptx (powerpoint)
- Всего слайдов:30 слайдов
- Для класса:1,2,3,4,5,6,7,8,9,10,11
- Размер файла:475.33 kB
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- Автор:неизвестен
Слайды и текст к этой презентации:
№1 слайд
Содержание слайда:
№2 слайд
Содержание слайда: Include Files
The include (or require) statement takes all the text/code/markup that exists in the specified file and copies it into the file that uses the include statement.
Including files is very useful when you want to include the same PHP, HTML, or text on multiple pages of a website.
№3 слайд
Содержание слайда: Example of include
<!DOCTYPE html>
<html>
<body>
<div class="menu">
<?php include 'menu.php';?>
</div>
<h1>Welcome to my home page!</h1>
<p>Some text.</p>
<p>Some more text.</p>
</body>
</html>
№4 слайд
Содержание слайда: PHP include vs. require
The require statement is also used to include a file into the PHP code.
However, there is one big difference between include and require; when a file is included with the include statement and PHP cannot find it, the script will continue to execute.
If we do the same example using the require statement, the echo statement will not be executed because the script execution dies after the require statement returned a fatal error.
№5 слайд
Содержание слайда: File and file handleing
№6 слайд
Содержание слайда: Simple syntax to read file in php
<?php
echo readfile("webdictionary.txt");
?>
№7 слайд
Содержание слайда: File Open/Read/Close
<?php
$myfile = fopen("webdictionary.txt", "r") or die("Unable to open file!");
echo fread($myfile,filesize("webdictionary.txt"));
fclose($myfile);
?>
№8 слайд
Содержание слайда: Create and write on File
// create file
$myfile = fopen("testfile.txt", "w")
№9 слайд
Содержание слайда: Forms and Files
№10 слайд
Содержание слайда:
№11 слайд
Содержание слайда: Create The Upload File PHP Script
<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
} else {
echo "File is not an image.";
$uploadOk = 0;
}
}
?>
№12 слайд
Содержание слайда: Check if File Already Exists
// Check if file already exists
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$uploadOk = 0;
}
№13 слайд
Содержание слайда: Limit File Size
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
//If the file is larger than 500KB, an error message is displayed
№14 слайд
Содержание слайда: Limit File Type
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
//The code only allows users to upload JPG, JPEG, PNG, and GIF files. All other file types gives an error message
№15 слайд
Содержание слайда: Complete Upload File PHP Script (part 1)
<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
} else {
echo "File is not an image.";
$uploadOk = 0;
}
}
№16 слайд
Содержание слайда: Complete Upload File PHP Script (part 2)
// Check if file already exists
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
№17 слайд
Содержание слайда: Complete Upload File PHP Script (part 3)
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
} else {
echo "Sorry, there was an error uploading your file.";
}
}
?>
№18 слайд
Содержание слайда: PHP Images from Folder
№19 слайд
Содержание слайда: Glob ()
The glob() function returns an array of filenames or directories matching a specified pattern.
This function returns an array of files/directories, or FALSE on failure.
№20 слайд
Содержание слайда: Count ()
The count() function returns the number of elements in an array.
№21 слайд
Содержание слайда: Opendir () & Readdir ()
Opendir is function to open a directory
Readdir is function to read files in a directory that is open
№22 слайд
Содержание слайда: PHP pathinfo() Function
The pathinfo() function returns an array that contains information about a path.
The following array elements are returned:
[dirname]
[basename]
[extension]
№23 слайд
Содержание слайда: in_array ()
It searches for a value in an array
№24 слайд
Содержание слайда: <?php
$path = "images/"; // path to images folder
$file_count = count(glob($path . "*.{png,jpg,jpeg,gif}", GLOB_BRACE));
if($file_count > 0)
{
$fp = opendir($path);
while($file = readdir($fp))
{
$ext = pathinfo($file, PATHINFO_EXTENSION);
$ext_array = ['png', 'jpg', 'jpeg', 'gif'];
if (in_array($ext, $ext_array))
{
$file_path = $path . $file;?>
<div class="col-md-4 col-xs-6">
<a href="<?php echo $file_path; ?>" title="My Favorites" data-gallery><img src="<?php echo $file_path; ?>" class="img-responsive" /></a>
</div>
<?}
}
closedir($fp);
}
?>
№25 слайд
Содержание слайда: PHP Error Handling
№26 слайд
Содержание слайда: Error Handling
When creating scripts and web applications, error handling is an important part. If your code lacks error checking code, your program may look very unprofessional and you may be open to security risks.
This tutorial contains some of the most common error checking methods in PHP.
We will show different error handling methods:
Simple "die()" statements
Custom errors and error triggers
Error reporting
№27 слайд
Содержание слайда: Example of Error Handling
№28 слайд
Содержание слайда: Exception handling
Exception handling is used to change the normal flow of the code execution if a specified error (exceptional) condition occurs. This condition is called an exception.
This is what normally happens when an exception is triggered:
The current code state is saved
The code execution will switch to a predefined (custom) exception handler function
Depending on the situation, the handler may then resume the execution from the saved code state, terminate the script execution or continue the script from a different location in the code
№29 слайд
Содержание слайда: Exception handling example
When an exception is thrown, the code following it will not be executed, and PHP will try to find the matching "catch" block.
If an exception is not caught, a fatal error will be issued with an "Uncaught Exception" message.
№30 слайд
Содержание слайда: Example of Try, throw and catch
<?php
//create function with an exception
function checkNum($number) {
if($number>1) {
throw new Exception("Value must be 1 or below");
}
return true;
}
//trigger exception in a "try" block
try {
checkNum(2);
//If the exception is thrown, this text will not be shown
echo 'If you see this, the number is 1 or below';
}
//catch exception
catch(Exception $e) {
echo 'Message: ' .$e->getMessage();
}
?>
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