log1p            2889 ext/standard/basic_functions.c 	PHP_FE(log1p,															arginfo_log1p)
log1p             262 ext/standard/math.c 	return(log1p(x));
log1p             662 ext/standard/math.c PHP_FUNCTION(log1p)
log1p              76 ext/standard/php_math.h PHP_FUNCTION(log1p);