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require

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(PHP 4, PHP 5, PHP 7, PHP 8)

require is identical to include except upon failure it will also produce an Error exception (E_COMPILE_ERROR level error prior to PHP 8.0.0) whereas include will only produce a warning (E_WARNING level error).

require is identical to include() except upon failure it will also produce an Error exception (E_COMPILE_ERROR level error prior to PHP 8.0.0) whereas include() will only produce a warning (E_WARNING level error).

See the include() documentation for how this works.

Source: language/control-structures/require.xml · from the official PHP manual (php/doc-en)