laravel 5.5中遇到的格式不正确的数值，使用的是php 7.2

Question

echo  ('john'.'_'.str_replace('.',time(),microtime()*rand()));

i am using php laravel 5.5 and my php version is 7.2

Also I have tried:

composer update

and:

composer update symfony/var-dumper

but the problem still occurs.

Answer 1

Problem is appears in microtime(). It returns something like 0.13685800 1522584183. There is space among of them. Because of this product of microtime() and *rand() can't be calculated.

You must get first or second part of microtime():

For first part:

echo ('john'.'_'.str_replace('.',time(),explode(' ',microtime())[1]*rand()));

For second part:

echo ('john'.'_'.str_replace('.',time(),explode(' ',microtime())[2]*rand()));

explode() function splits string to 2 part and return this parts as array.