Handling Files In particular, uploading files.

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Presentation transcript:

Handling Files In particular, uploading files. * Lecture 21 Handling Files In particular, uploading files. * Course logo spider web photograph from Morguefile openstock photograph by Gabor Karpati, Hungary.

CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz Overall Workflow User Uploads File Do necessary data validation Check file type, size, etc. Move temp file to permanent location. Two step process provide a level of protection. Record the transaction in a database Accurate record of site accessible files. 11/17/2018 CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz

CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz Setting Up the Form Set Form Encode Type <form method='post’ enctype='multipart/form-data'> Create form element <input type='file' name='filename' size='10'> 11/17/2018 CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz

CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz $_FILES Array How file information is passed back to PHP on the Server. Array element $_FILES['file']['name'] $_FILES['file']['type'] $_FILES['file']['size'] $_FILES['file']['tmp_name'] $_FILES['file']['error'] … The name of the uploaded file (e.g., smiley.jpg) … The content type of the file (e.g., image/jpeg – More Next) … The file’s size in bytes … The name of the temporary file stored on the server … The error code resulting from the file upload 11/17/2018 CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz

CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz Common Media Types application/pdf image/gif multipart/form-data text/xml application/zip image/jpeg text/css video/mpeg audio/mpeg image/png text/html video/mp4 audio/x-wav image/tiff text/plain video/quicktime 11/17/2018 CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz

CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz Types of Validation File Type Make sure appropriate type Make sure file extension matches type File Size Check size of file PHP has a maximum size which is set in php.ini 11/17/2018 CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz

CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz Saving Often files are saved to the local disk move_uploaded_file() Also possible to save to DB. However, in practice isn’t used very much. However, we often save a record in the DB referencing the file (see example) 11/17/2018 CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz

Extended Example Intro We will demonstrate key features with an extended example: lec21.zip Note, it will not allow uploads on the CS Server – think about security. You will download to your own site and experiment. And then disable if on a public server! 11/17/2018 CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz

CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz Extended Example Page 11/17/2018 CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz

Extended Example Roadmap Similar overall structure as before. 11/17/2018 CSU CT 310 Web Development ©Ross Beveridge & Jaime Ruiz