(PHP 5 >= 5.0.0, PHP 7) Return the key of the current element
(PHP 5 >= 5.5.0, PHP 7) Examples:
(PHP 5 >= 5.1.3, PHP 7) Gets system load average
(No version information available, might only be in Git) Gets the stack trace
(No version information available, might only be in Git) Gets the file in which the error occurred
(PHP 4, PHP 5, PHP 7) Examples:
(PHP 5 >= 5.1.0, PHP 7) Gets the exception severity
(PHP 5 >= 5.3.0, PHP 7) Examples:
(PHP 5 >= 5.5.0, PHP 7) Throw an exception into the generator
Examples: Creating a copy of an object with fully replicated properties is not always the wanted behavior. A good
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