Strict programming in PHP
by Gabriel Caruso
phpCE 2018
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Backend Developer at Leroy Merlin
PHP Internals and Externals Evangelist
PHPSP Member
@carusogabriel
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Agenda
- What does strict programming means
- Benefits of using a strict programming language
- Coding strict with PHP
- How to ensure that my project is strict safe
- Strict changes for PHP’s core
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What does strict
programming mean?
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Differences
Strict programming
A way, a paradigm, in how we
can treat our coding
Strict programming language
A language that is build on
top of strict programming
paradigm
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Benefits of using a strict
programming language
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- Built-in scalar types
- More strongly-typed code
- Closed API code
- Less Runtime exceptions
- Know the flow of your code
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strict programming in PHP
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Equal operator
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Equal operator
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Equal operator
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Equal operator
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Equal operator
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Equal operator
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Equal operator
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Equal operator
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Equal operator
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Identical operator
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Empty() Function
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Use PHP instead!
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is_null() only checks for the null type
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is_null() only checks for the null type
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But use the identical operator when you aren’t sure
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switch conditions are loosely compare
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if conditions aren’t that trustable
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Only pass booleans to if conditions
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What about the php 7
scalar types?
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Weak scalar types do casting
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Use Strict scalar types!
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*Only non-NaN floats between PHP_INT_MIN and PHP_INT_MAX are accepted
†Non-numeric strings are not accepted
‡Only if the object has a __toString() method
inductions of scalar types
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How to ensure that my
project is strict safe?
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Static analysis
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Coding standards
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strict changes for PHP’s core?
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Typed Properties in PHP 7.4
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References you can study beyond this talk
- https://wiki.php.net/rfc/scalar_type_hints_v5#behaviour_o
f_weak_type_checks
- https://php.net/types-comparisons
- https://www.phparch.com/2018/04/testing-strategy-with-the
-help-of-static-analysis/
- https://github.com/phpstan/phpstan-strict-rules
- https://github.com/slevomat/coding-standard