PHP Unknown error: Collator::__construct(): collator_create: unable to open ICU collator in Unknown on line 0

Full error message that occurred on mac (mavericks) homebrew version of php (php54, php55, php56) with php-intl (php54-intl, php55-intl, php56-intl) with intl.use_exceptions=1 and intl.error_level=E_ALL :

Unknown error: Collator::__construct(): collator_create: unable to open ICU collator in Unknown on line 0
PHP Fatal error: Uncaught exception 'IntlException' with message 'collator_create: unable to open ICU collator' in -:2
Stack trace:
#0 -(2): Collator->__construct('en_US')
#1 {main}
thrown in - on line 2

or without the default ini settings

PHP Fatal error: Call to a member function getLocale() on a non-object in - on line 3

Fatal error: Call to a member function getLocale() on a non-object in – on line 3

or in symfomny2

PHP Fatal error: Call to a member function asort() on null in APP_DIR/vendor/symfony/icu/Symfony/Component/Icu/IcuRegionBundle.php on line 79

After couple of hours I found the error to be inside icu4c library installed via homebrew.

The fix for this error is to reinstall the icu4c library, php and php-intl

brew reinstall icu4c php55 php55-intl

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