[nvrm]

In Unix CLI, it’s very practical to redirect only errors to a file:

./script 2> errors.log

From your script, either use var_dump() or equivalent as usual (both STDOUT and STDERR will receive the output), but to write only in the log file:

fwrite(STDERR, "Debug infos\n"); // Write in errors.log^

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Then from another shell, for live changes:

tail -f errors.log

or simply

watch cat errors.log

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