The String Component (Symfony Docs)
Note If you install this component outside of a Symfony application, you must require the vendor/autoload.php file in your code to enable the class autoloading mechanism provided by Composer. Read this article for more details. What is a String? You can skip this section if you already know what a "code point" or a "grapheme cluster" are in the context of handling strings. Otherwise, read this sec
PHP: rfc:string_to_number_comparison
Comparisons between strings and numbers using == and other non-strict comparison operators currently work by casting the string to a number, and subsequently performing a comparison on integers or floats. This results in many surprising comparison results, the most notable of which is that 0 == "foobar" returns true. This RFC proposes to make non-strict comparisons more useful and less error prone
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