PHP Mobile Internet Development Notes (5) - Basic Function Library

PHP Mobile Internet Development Notes (5) - Basic Function Library_PHP Tutorial

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Release： 2016-07-13 10:32:15

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1. Math function library

● floor

Round to the nearest whole number (Round down)

float floor (float $value);
<?php
echo(floor(0.60)." ");
echo(floor(0.40)." ");
echo(floor(5)." ");
echo(floor(5.1)." ");
echo(floor(-5.1)." ");
echo(floor(-5.9)." ")
?>
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● ceil
Round up (round up)
float ceil(float $value);
<?php
echo(ceil(0.60)." ");
echo(ceil(0.40)." ");
echo(ceil(5)." ");
echo(ceil(5.1)." ");
echo(ceil(-5.1)." ");
echo(ceil(-5.9)." ")
?>
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● max
Take the maximum value
mixed max(mixed $value, mixed $value, ...);
<?php
echo(max(5,7)." ");
echo(max(-3,5)." ");
echo(max(-3,-5)." ");
echo(max(7.25,7.30)." ");
?>
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● min
Take the minimum value
mixed min(mixed $value, mixed $value, ...);
<?php
echo(min(5,7)." ");
echo(min(-3,5)." ");
echo(min(-3,-5)." ");
echo(min(7.25,7.30)." ");
?>
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● pow
Power operation
number pow(number $base, number $expr);
<?php
echo pow(4,2)." ";
echo pow(6,2)." ";
echo pow(-6,2)." ";
echo pow(-6,-2)." ";
echo pow(-6,5.5)." ";
?>
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● sqrt
Take the square root
float sqrt(float $arg)
<?php
echo(sqrt(0))." ";
echo(sqrt(1))." ";
echo(sqrt(9))." ";
echo(sqrt(0.64))." ";
echo(sqrt(-9))." ";
?>
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● rand
Generate random numbers
int mt_rand(int $min, int max);
<?php
echo rand()." ";
echo rand(10,100)." ";
?>
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● mt_rand
Produces a better random number
int mt_rand(int $min, int max);
Similar to the rand usage and output results above, this is 4 times faster than rand.
● round
Round
float round(float $val [, int $precision =0])
The second parameter is optional, specifying the number of decimal places to retain
● number_format
Format number by thousands grouping
float number_format(float $number, int $decimals=0, string $dec_point=",', string $thousands_sep=',');

2. Date and time function library

● time
Returns the current Unix timestamp
int time(void);
<?php
echo time()." ";
$nextWeek = time() + (7 * 24 * 60 * 60); // 7 days; 24 hours; 60 mins; 60secs
echo 'Now: '. date('Y-m-d') ." ";
echo 'Next Week: '. date('Y-m-d', $nextWeek) ." ";
?>
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● date
Format a local time/date
string date(string format[, int timestamp]);
● getdate
Get date /Time information
array getdate([int timestamp]);
<?php
print_r(getdate());
?>
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MD5 ha Hope
string md5(string $str[, bool $raw_output=false]);

strpos

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

int strpos(string haystack, mixed needle[, int offset]);