How did I fix «Unable to load dynamic library php_intl.dll» in Windows 10?

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Step 1

I have added the PHP directory to the system PATH:

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stackoverflow.com/a/18935208

Step 2

I have installed Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019 (vc_redist.x64.exe):
support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads#section-2