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PHP Built-in Functions

PHP built-in functions

PHP comes standard with many built-in functions. They give us an easier way to implement and repeat popular tasks throughout a program. A popular example is the echo function.

Many more are documented at In addition to a description of what the function does, the documentation for each function denotes:

  • The name of the function
  • Required parameters and their types
  • Optional parameters (in square brackets, []), their types, and default values
  • The return type of the function (after the final colon, :)
echo "I am built in";

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