PHP Regex: preg_match, preg_replace and Capture Groups
Delimiters, character classes, anchors and capture groups — the parts of PHP regex you actually use, and the one job you must never give it.
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📝 Web Development📝 Category
Web Development Posts
Browse all posts filed under Web Development.
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📝 Web Development
📝 Web DevelopmentPHP JSON: json_encode and json_decode Explained
Two functions carry almost every API you will write. json_encode, json_decode, the array-or-object rule, and why a silent null is not an empty result.
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📝 Web DevelopmentPHP Cookies: setcookie, $_COOKIE and Expiry
setcookie() writes a header, not a variable, which is why the cookie you just set is not in $_COOKIE until the browser sends it back on the next request.
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📝 Web DevelopmentPHP Date and Time: Format, Parse and Compare Dates
date() to print it, strtotime() to read it, DateTime to do arithmetic on it — and the timezone setting behind most off-by-five-hours bugs.
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📝 Web DevelopmentPHP switch: Cleaner Branching Than if else
One variable, a list of values, and the missing break that catches everybody once. PHP switch explained, plus loose comparison and PHP 8's match.
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📝 Web DevelopmentPHP Login System: Register, Log In and Protect Pages
Forms, sessions, a database and hashing finally come together. Registration, login, a page only members can reach, and a logout that clears all three of the things a session leaves behind.
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📝 Web DevelopmentPHP Security: SQL Injection, XSS and Password Hashing
Four habits you build into ordinary code: never let user input become SQL, never let it become HTML, never store a password, and never assume a request came from your own page. Each problem shown breaking, then fixed.
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📝 Web DevelopmentPHP include and require: Reuse Code Across Pages
Every site repeats its header and footer on every page. include and require are how you write that markup once and pull it in everywhere — with the four keyword variants and the path mistake that only shows up in production.
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📝 Web DevelopmentPHP File Upload: Handle $_FILES Safely
Learn PHP file upload the safe way: read $_FILES, verify the true type with finfo, limit the size, and rename before storing. A full beginner guide.
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