PHPExcel root directory
MAX_VALUE = 1.2E+308
MAX_VALUE
M_2DIVPI = 0.6366197723675814
2 / PI
MAX_ITERATIONS = 256
MAX_ITERATIONS
PRECISION = 8.88E-16
PRECISION
acosh( $x)
asinh( $x)
atanh( $x)
mb_str_replace( $search, $replace, $subject)