(PHP 5 >= 5.3.0, PHP 7) Examples:

(PHP 5 >= 5.0.0, PHP 7) Whether an offset exists

Examples: Example of object comparison in PHP 5 When using the comparison operator

(PHP 5 >= 5.1.0, PHP 7) Construct the exception

SSL context option listing Context options for ssl:// and tls:// transports.

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Environment variables

HTTP context option listing Context options for http:// and https:// transports.

(PHP 4, PHP 5, PHP 7) Array of arguments passed to script

(PHP 4, PHP 5, PHP 7) Unpack data from binary string

(PHP 4, PHP 5, PHP 7) Delay execution int sleep