Issue
This Content is from Stack Overflow. Question asked by Nuno
Consider this string (notice the horizontal scroll – the string is long):
$content = 'Xxxxxx xx xxxx xxxxxx/xxxx xxxxxxx xx xxxxx xx xxx XXXXXXX/XXXXX XXXX XXXXXXX XXXX XXXXXX XXXXX XXXXXX XXXXXX XXXXXX XXXXX XXXXXX';
I have my own mb_trim() function to support unicode strings, but I found it’s performing really bad for this string in specific.
After debugging, I realized that it’s just the “end-of-string” bit that doesn’t perform, while “beginning-of-string” is fine.
So, just doing this (minimal code):
$trim = preg_replace('/s+$/u', '', $content);
This takes 2s ~ 3s.
But even without the u modifier, it still takes ~1.60s.
If I replace the spaces in the middle with some letter, the preg_replace will take 0s.
Is there a way to fix this performance issue?
Solution
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