Basic PHP
Within a namespace, for accessing the built-in PHP classes you can prefix the class name with a . . . . . and let PHP look in the global class list.

backslash
ampersand
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Basic PHP
How does the identity operator === compare two values?

It bases its comparison on the C strcmp function exclusively
It converts both values to strings and compares them
It returns True only if they are both of the same type and value
If the two values are strings, it performs a lexical comparison
It converts them to a common compatible data type and then compares the resulting values

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