In-depth understanding of several PHP algorithms: PHP bubbling, PHP bisection, PHP finding prime numbers, PHP multiplication table

In-depth understanding of several PHP algorithms: PHP bubbling, PHP bisection, PHP finding prime numbers, PHP multiplication table_PHP tutorial

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Release： 2016-07-21 15:08:41

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Compilation of several PHP algorithms involves the following examples.
PHP Bubble
PHP Dichotomy
PHP Finding Prime Numbers
PHP Multiplication Table

PHP bubbling method example

Copy code The code is as follows:

//PHP bubbling from small to large
function maopao(&$arr)
{
 if(!empty($arr))
 {
 for($i=0; $i                                                                                                                                                                                                                                                                                    $temp = $arr[$i];
 $arr[$i] = $arr[$j];
 $arr[$j] = $temp;
 }
 }
 }
 return $arr;
 }
}

php binary search code example

Copy code

The code is as follows: //Binary searchfunction erfenfa($a,$arr)

{

print_r($arr);
if(!empty($a) && !empty($arr ))
{
$start = 0;
$end = count($arr)-1;
$i = 0;
while($start <= $end) {
$i ++; {
$step]);
return $a;
}
if($a >$arr[$step])
{
$start = $step;
}

if($a < $arr[$step])
{
$end = $step;
}
}
}

}

php find prime numbers – calculate the prime numbers between a and b. Code example

Copy code
The code is as follows:

//php find prime numbers - Calculate the prime numbers between a and b.
function sushu($a,$b)
{
if(!empty($a) && !empty($b))
{
if($b<$a) return;
$temp = array();

for($i=$a;$i <=$b;$i++)
{
$j = intval(sqrt($i));
$flag = true;
if($i<=3)
{
$temp[$i] = $i;
}else
{
for($x=2;$x<= $j;$x++)
🎜> }
if($flag)
$temp[$i] = $i;
}
}
}
return $temp;
}
}

PHP output multiplication table - recursive code example

Copy code
The code is as follows:

//PHP output multiplication table - recursivefunction digui($a,$step){ if($a >$step) return; if( !empty ($a) && !empty($step) )

{
for($i=1;$i<=$a;$i++)
{
echo $i.'*' .$a.'='.$a*$i."t";
if($i == $a ) echo '
';
}
$a = $a + 1;
digi($a,$step);
}
}

PHP output multiplication table - loop code example

Copy code
The code is as follows:

//PHP output multiplication table - loopfunction chengfa($a,$step){ if( !empty($a) && !empty($step) ) {
for($i=$a;$i<=$step;$i++)
{
for($j=1;$j<=$i;$j++)
{
less less have been more > }
}
}
}

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The arrangement of several PHP algorithms involves the following examples. PHP bubbling PHP bisection method PHP finding prime numbers PHP multiplication table PHP bubbling method Example Copy code The code is as follows: //PHP bubbling from small to large functi...