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#php
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#typescript
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#java
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#files
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#format
Bash
Multipart File Upload via cURL
Upload one or more files using -F. Optional extra form fields go through the same flag — quote carefully to preserve spaces.
@admin
PHP
Validate Uploaded File
A defense-in-depth check for $_FILES uploads: confirms the upload completed, the size is within bounds, the MIME type matches an allow-list (by libmagic, not by extension), and the file landed where PHP expected.
PHP
cURL Multipart File Upload
Upload one or more files via multipart/form-data using cURL's CURLFile abstraction. No manual boundary or body construction needed.
PHP
Detect MIME Type via Magic Bytes
Use PHP's built-in finfo (libmagic) to detect a file's true MIME type from its bytes — not from the extension, which can be lied about. Critical for validating user uploads.
PHP
Resize Image to Max Dimension
Shrink an uploaded image so its longest side is no more than $maxDim pixels, preserving aspect ratio. Re-encodes to JPEG at the given quality. Uses the GD extension.
Python
Multipart File Upload
POST a file (or several) as multipart/form-data using requests, with optional extra form fields. Lets you upload to /avatar-style endpoints without manual boundary construction.