PHPyths Buster: A great string performance test! (updated) - Krzych Jończyk
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PHP String Concatenation
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I was curious what way to concatenate strings in PHP is the fastest. Here are my results in PHP 5.6 and PHP 7. : r/PHP
PHP Concat()
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GitHub - magnetikonline/php-string-concatenate-benchmark: Trival PHP string concatenation method benchmarks, proving that your time is better spent elsewhere.
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PHP Exercises: Concat two given strings - w3resource