PHP での変数の型の比較と並べ替え

$str1 = "10"; $str2 = 10; // 使用双等号（==）进行比较 if ($str1 == $str2) { echo "相等"; } else { echo "不相等"; } // 输出：相等 // 使用全等号（===）进行比较 if ($str1 === $str2) { echo "全等"; } else { echo "不全等"; } // 输出：不全等 $num1 = 10; $num2 = 5; // 使用大于号（>）进行比较 if ($num1 > $num2) { echo "num1大于num2"; } else { echo "num1小于num2"; } // 输出：num1大于num2

$numbers = array(3, 1, 2, 5, 4); // 使用sort()函数对数组进行升序排序 sort($numbers); print_r($numbers); // 输出：Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) // 使用rsort()函数对数组进行降序排序 rsort($numbers); print_r($numbers); // 输出：Array ( [0] => 5 [1] => 4 [2] => 3 [3] => 2 [4] => 1 ) $students = array( array("name" => "Tom", "score" => 80), array("name" => "Jerry", "score" => 90), array("name" => "Alice", "score" => 70) ); // 使用usort()函数对数组按score字段进行排序 usort($students, function($a, $b) { return $a["score"] - $b["score"]; }); print_r($students); // 输出：Array ( [0] => Array ( [name] => Alice [score] => 70 ) // [1] => Array ( [name] => Tom [score] => 80 ) // [2] => Array ( [name] => Jerry [score] => 90 ) )