PHP PALABRAS RESERVADAS PHP
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 | |
| var | while | FUNCTION | CLASS | METHOD |
FUENTE: MANUAL DE AYUDA PHP
FUNCIONES MATEMATICAS
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�