PHP Mobile Internet Development Notes (5)--Basic function Library _php Tutorial

I. Mathematical function library

Floor

Rounding (rounding down)

Float Floor (float $value);

 
   "); Echo (Floor (0.40)."
"); Echo (Floor (5)."
"); Echo (Floor (5.1)."
"); Echo (Floor (-5.1)."
"); Echo (Floor (-5.9)."
")?>

Ceil

Rounding (rounding up)

float ceil (float $value);

 
   "); Echo (Ceil (0.40)."
"); Echo (Ceil (5)."
"); Echo (Ceil (5.1)."
"); Echo (Ceil (-5.1)."
"); Echo (Ceil (-5.9)."
")?>

Max

Take maximum value

Mixed Max (mixed $value, mixed $value, ...);

 
   "); Echo (Max ( -3,5)."
"); Echo (Max ( -3,-5)."
"); Echo (Max (7.25,7.30)."
");? >

Min

Take the minimum value

Mixed min (mixed $value, mixed $value, ...);

 
   "); Echo (min ( -3,5)."
"); Echo (min ( -3,-5)."
"); Echo (min (7.25,7.30)."
");? >

Pow

Power operation

Number POW (number $base, number $expr);

 
   "; Echo Pow (6,2)."
"; Echo Pow ( -6,2)."
"; Echo Pow ( -6,-2)."
"; Echo Pow ( -6,5.5)."
";? >

sqrt

Take the square root

float sqrt (float $arg)

 
   "; Echo (sqrt (1))."
"; Echo (sqrt (9))."
"; Echo (sqrt (0.64))."
"; Echo (sqrt (-9))."
";? >

Rand

Generate random numbers

int Mt_rand (int $min, int max);

 
   "; Echo rand (10,100)."
";? >

Mt_rand

produce a better random number

int Mt_rand (int $min, int max);

Similar to the above Rand usage and output, this is 4 times times faster than Rand.

Round

Rounded

Float round (float $val [, int $precision = 0])

The second parameter is optional, which specifies the number of decimal places reserved

Number_format

Formatting numbers with thousands grouping

Float Number_format (float $number, int $decimals =0, string $dec _point= ", ', String $thousands _sep= ', ');

Second, date time function library

Time

Returns the current UNIX timestamp

int time (void);

 
   "; $nextWeek = time () + (7 * 24 * 60 * 60); 7 days; Hours; mins; 60secsecho ' Now:       '. Date (' y-m-d '). "
Echo ' Next Week: '. Date (' y-m-d ', $nextWeek). "
";? >

Date

Format a local time/date

String Date (string format[, int timestamp]);

GetDate

Get Date/Time information

Array getdate ([int timestamp]);

MD5 Hash

String MD5 (string $str [, bool $raw _output=false]);

Strpos

Returns the position of the first occurrence of a character in another character

int Strpos (String haystack, mixed needle[, int offset]);

http://www.bkjia.com/PHPjc/755796.html www.bkjia.com true http://www.bkjia.com/PHPjc/755796.html techarticle first, the mathematical function library floor rounding (rounding down) float floor (float $value); "); Echo (Floor (0.40)." "); Echo (Floor (5)." "); Echo (Floor (5.1)." "); Echo (Floor (-5.1)." "); EC ...

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