Table G-1. PHP Keywords

and or xor FILE exception php_user_filter
LINE array() as break case
cfunction class const continue declare
default die() do echo() else
elseif empty() enddeclare endfor endforeach
endif endswitch endwhile eval exit()
extends for foreach function global
if include() include_once() isset() list()
new old_function print() require() require_once()
return() static switch unset() use



Table 1. Math constants

Constant Value Description
M_PI 3.14159265358979323846 Pi
M_E 2.7182818284590452354 e
M_LOG2E 1.4426950408889634074 log_2 e
M_LOG10E 0.43429448190325182765 log_10 e
M_LN2 0.69314718055994530942 log_e 2
M_LN10 2.30258509299404568402 log_e 10
M_PI_2 1.57079632679489661923 pi/2
M_PI_4 0.78539816339744830962 pi/4
M_1_PI 0.31830988618379067154 1/pi
M_2_PI 0.63661977236758134308 2/pi
M_SQRTPI 1.77245385090551602729 sqrt(pi) [4.0.2]
M_2_SQRTPI 1.12837916709551257390 2/sqrt(pi)
M_SQRT2 1.41421356237309504880 sqrt(2)
M_SQRT3 1.73205080756887729352 sqrt(3) [4.0.2]
M_SQRT1_2 0.70710678118654752440 1/sqrt(2)
M_LNPI 1.14472988584940017414 log_e(pi) [4.0.2]
M_EULER 0.57721566490153286061 Euler constant [4.0.2]

Only M_PI is available in PHP versions up to and including PHP 4.0.0. All other constants are available starting with PHP 4.0.0. Constants labeled [4.0.2] were added in PHP 4.0.2.

Table of Contentsabs – Absolute valueacos – Arc cosineacosh – Inverse hyperbolic cosineasin – Arc sineasinh – Inverse hyperbolic sineatan2 – Arc tangent of two variablesatan – Arc tangentatanh – Inverse hyperbolic tangentbase_convert – Convert a number between arbitrary basesbindec – Binary to decimalceil – Round fractions upcos – Cosinecosh – Hyperbolic cosinedecbin – Decimal to binarydechex – Decimal to hexadecimaldecoct – Decimal to octaldeg2rad – Converts the number in degrees to the radian equivalentexp – Calculates the exponent of e (the Neperian or Natural logarithm base)expm1 – Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zerofloor – Round fractions downfmod – Returns the floating point remainder (modulo) of the division of the argumentsgetrandmax – Show largest possible random valuehexdec – Hexadecimal to decimalhypot – Returns sqrt(num1*num1 + num2*num2)is_finite – Finds whether a value is a legal finite numberis_infinite – Finds whether a value is infiniteis_nan – Finds whether a value is not a numberlcg_value – Combined linear congruential generatorlog10 – Base-10 logarithmlog1p – Returns log(1 + number), computed in a way that accurate even when the value of number is close to zerolog – Natural logarithmmax – Find highest valuemin – Find lowest valuemt_getrandmax – Show largest possible random valuemt_rand – Generate a better random valuemt_srand – Seed the better random number generatoroctdec – Octal to decimalpi – Get value of pipow – Exponential expressionrad2deg – Converts the radian number to the equivalent number in degreesrand – Generate a random valueround – Rounds a floatsin – Sinesinh – Hyperbolic sinesqrt – Square rootsrand – Seed the random number generatortan – Tangenttanh – Hyperbolic tangentFUENTE : MANUAL DE AYUDA PHP�

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