Where can I find in the PHP source files where there is an internal function code like is_string ()?
1 answer
internal / standard / type.c
You can also find it online:
http://git.php.net/?p=php-src.git&a=search&h=HEAD&st=grep&s=%28is_string%29
Edit to add: You can find another version by replacing the h key, for example: h = refs% 2Fheads% 2FPHP-5.6.31
PHP5 uses fewer macros than PHP7, so it looks more like regular C.
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