Pablo questions

• Stop multiple sessions accessing the same file simultaneously
• How to flock() an image?
• PHP output buffering to text file
• One click upload button
• Detect how much stress the mysql database is currently under with PHP
• generate a random number between 1 and x where a lower number is more likely than a higher one
• Detect when a user chooses a file using a file input
• Do you Ajax JSON or HTML? [closed]
• Detect if PHP session exists
• is it possible to open a popup with javascript and then detect when the user closes it?

Pablo answers