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@ 2016-06-19T15:31:43Z

<?php

// 7f ef ff ff ff ff ff ff (Max double)
// https://en.wikipedia.org/wiki/Double-precision_floating-point_format#Double-precision_examples

// 7f = 127
// ef = 239
// ff = 255
$str = chr(127) . chr(239) . str_repeat(chr(255), 6);
echo $str;
echo (string) unpack('d', $str)[1], PHP_EOL;

Output
Performance
VLD
References
Branches

str_repeat: documentation ( source)
unpack: documentation ( source)

preferences:dark modelive preview

57.55 ms | 402 KiB | 5 Q