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Migrating from PHP 7.3.x to PHP 7.4.x

Appendix Edit on GitHub ✎

This new minor version brings with it a number of new features and a few incompatibilities that should be tested for before switching PHP versions in production environments.

Seealso 7.0.x, 7.1.x, 7.2.x and 7.3.x.

New-features New-classes New-functions Constants Incompatible Deprecated Removed-extensions Other-changes Windows-support

In this section

Backward Incompatible Changes

Trying to use values of type null, bool, int, float or resource as an array (such as $null...

Deprecated Features

The array and string offset access syntax using curly braces is deprecated. Use $var[$idx]...

New Classes and Interfaces

ReflectionReference

New Features

Weak references allow the programmer to retain a reference to an object that does not prev...

New Functions

get_mangled_object_vars

New Global Constants

PHP_WINDOWS_EVENT_CTRL_C

Other Changes

A specialized VM opcode for the array_key_exists function has been added, which improves p...

Removed Extensions

These extensions have been moved to PECL and are no longer part of the PHP distribution. T...

Windows Support

configure now regards additional CFLAGS and LDFLAGS set as environment variables.

Source: appendices/migration74.xml · from the official PHP manual (php/doc-en)