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From PHP Tutorial
In PHP, how are predefined con...
__LINE__: The current line number in the file. __FILE__: The full path and file name of the file....
Magic constants, predefined co...
1. Magic constants There are eight magic constants in PHP, and their values will change as their p...
How to define global variables...
Global is a special command in php. We just call it a super global variable. Let me introduce how I ...
PHP uses Global to define how ...
Global is a special command in PHP. Everyone just calls it a super global variable. Let me introduce...
What are the predefined variab...
[Super global variables] Super global variables are internal variables that can always be used in al...
Discrimination of php data typ...
PHP does not require (or support) explicit type definitions in variable definitions; the variable ty...
How to determine the type of a...
gettype() is used to get the type of a variable. The returned type string may be one of the followin...
PHP determines variable type
Commonly used functions in PHP to determine variables include gettype(), is_array(), is_bool(), is_f...
Pseudotypes and pseudovariable...
1. Pseudo-types There are three pseudo-types in PHP, namely: 1. mixed mixed type. 2. number digital ...
Detailed explanation of php Ca...
Since PHP 5.4 the callback type callback can be specified using the callable type. This document use...