php算法实例分享_PHP

<&#63;php
  $n = $_GET['n'];
  for ($i=0; $i < $n; $i++) {
    echo "0";
  }
&#63;>

<&#63;php
  $n = $_GET['n'];
  for ($i=0; $i < $n; $i++) {
    if ($i % 2 ==0) {
      echo "0";
    } else{
      echo "1";
    }
  }
&#63;>

<&#63;php

for ($i = 0; $i < 10; $i++) {
  for ($j = 0; $j <= $i; $j++) {
    if ($i % 2 == 0) {
      echo '0';
    } else {
      echo '1';
    }
  }
  echo '<br/>';
}

&#63;>

<&#63;php

for ($i = 0; $i < 10; $i++) {
  for ($j = 0; $j <= $i; $j++) {
    switch ($j % 2) {
      case '0':
      echo "0";
      break;
    case '1':
      echo "1";
      break;
    }
  }
  echo '<br/>';
}

&#63;>

<&#63;php

$i = 0;
while ($i < 10) {
  $j = 0;
  while ($j <= $i) {
    switch ($i % 2) {
      case 0:
        echo '0';
        break;
      case 1:
        echo '1';
        break;
    }
    $j++;
  }
  echo '<br/>';
  $i++;
}

&#63;>

<&#63;php
  $a = $_GET['a'];
  $b = $_GET['b'];
  $operator = $_GET['operator'];
  function calculate($a,$b,$operator) {
    switch ($operator) {
      case 'jia':
        $result = $a + $b;
        return $result;
        break;
      case 'jian':
        $result = $a - $b;
        return $result;
      break;
      case 'cheng':
        $result = $a * $b;
        return $result;
      break;
      case 'chu':
        $result = $a / $b;
        return $result;
      break;
    }
  }
  echo calculate($a,$b,$operator);
&#63;>