Qiao questions

• MySQL short-circuit OR
• Delete specific class in page (jQuery)
• Get random element by given priority [duplicate]
• Opening file in binary mode and saving it adds new line
• Initializing classes in module for namespace
• Initializing tooltip with JQueryUI
• Javascript keycodes for Alt, Ctrl, and Shift
• Open file with pyQt
• Bind several columns to one variable in PDO
• Check if array element data[i][j][k] exists

Qiao answers