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  • 数组运算符

    数组运算符
    例子名称结果
    $a +$b联合$a$b的联合。
    $a ==$b相等如果$a$b具有相同的键/值对则为TRUE
    $a ===$b全等如果$a$b具有相同的键/值对并且顺序和类型都相同则为TRUE
    $a !=$b不等如果$a不等于$b则为TRUE
    $a <>$b不等如果$a不等于$b则为TRUE
    $a !==$b不全等如果$a不全等于$b则为TRUE

    +运算符把右边的数组元素附加到左边的数组后面,两个数组中都有的键名,则只用左边数组中的,右边的被忽略。

    <?php
    $a = array("a" => "apple", "b" => "banana");
    $b = array("a" => "pear", "b" => "strawberry", "c" => "cherry");
    $c = $a + $b; // Union of $a and $b
    echo "Union of \$a and \$b: \n";
    var_dump($c);
    $c = $b + $a; // Union of $b and $a
    echo "Union of \$b and \$a: \n";
    var_dump($c);
    $a += $b; // Union of $a += $b is $a and $b
    echo "Union of \$a += \$b: \n";
    var_dump($a);
    ?>
    
    执行后,此脚本会显示:
    Union of $a and $b:
    array(3) {
      ["a"]=>
      string(5) "apple"
      ["b"]=>
      string(6) "banana"
      ["c"]=>
      string(6) "cherry"
    }
    Union of $b and $a:
    array(3) {
      ["a"]=>
      string(4) "pear"
      ["b"]=>
      string(10) "strawberry"
      ["c"]=>
      string(6) "cherry"
    }
    Union of $a += $b:
    array(3) {
      'a' =>
      string(5) "apple"
      'b' =>
      string(6) "banana"
      'c' =>
      string(6) "cherry"
    }
    

    数组中的单元如果具有相同的键名和值则比较时相等。

    Example #1 比较数组

    <?php
    $a = array("apple", "banana");
    $b = array(1 => "banana", "0" => "apple");
    var_dump($a == $b); // bool(true)
    var_dump($a === $b); // bool(false)
    ?>
    

    参见数组类型和数组函数章节。

    The union operator did not behave as I thought it would on first glance. It implements a union (of sorts) based on the keys of the array, not on the values.
    For instance:
    <?php
    $a = array('one','two');
    $b=array('three','four','five');
    //not a union of arrays' values
    echo '$a + $b : ';
    print_r ($a + $b);
    //a union of arrays' values
    echo "array_unique(array_merge($a,$b)):";
    // cribbed from http://oreilly.com/catalog/progphp/chapter/ch05.html
    print_r (array_unique(array_merge($a,$b)));
    ?>
    //output
    $a + $b : Array
    (
      [0] => one
      [1] => two
      [2] => five
    )
    array_unique(array_merge(Array,Array)): Array
    (
      [0] => one
      [1] => two
      [2] => three
      [3] => four
      [4] => five
    )
    The example may get u into thinking that the identical operator returns true because the key of apple is a string but that is not the case, cause if a string array key is the standart representation of a integer it's gets a numeral key automaticly. 
    The identical operator just requires that the keys are in the same order in both arrays:
    <?php
    $a = array (0 => "apple", 1 => "banana");
    $b = array (1 => "banana", 0 => "apple");
    var_dump($a === $b); // prints bool(false) as well
    $b = array ("0" => "apple", "1" => "banana");
    var_dump($a === $b); // prints bool(true)
    ?>
    
    Note that + will not renumber numeric array keys. If you have two numeric arrays, and their indices overlap, + will use the first array's values for each numeric key, adding the 2nd array's values only where the first doesn't already have a value for that index. Example:
    $a = array('red', 'orange');
    $b = array('yellow', 'green', 'blue');
    $both = $a + $b;
    var_dump($both);
    Produces the output:
    array(3) { [0]=> string(3) "red" [1]=> string(6) "orange" [2]=> string(4) "blue" }
    To get a 5-element array, use array_merge.
      Dan
    It should be mentioned that the array union operator functions almost identically to array_replace with the exception that precedence of arguments is reversed.
    $a=[ 3, 2, 1];
    $b=[ 6, 5, 4];
    var_dump( $a + $b );
    output:
    array(3) {
     [0]=>
     int(3)
     [1]=>
     int(2)
     [2]=>
     int(1)
    }
    The reason for the above output is that EVERY array in PHP is an associative one. 
    Since the 3 elements in $b have the same keys( or numeric indices ) as those in $a, those elements in $b are ignored by the union operator.
    []= could be considered an Array Operator (in the same way that .= is a String Operator). 
    []= pushes an element onto the end of an array, similar to array_push:
    <? 
     $array= array(0=>"Amir",1=>"needs");
     $array[]= "job";
     print_r($array);
    ?>
    Prints: Array ( [0] => Amir [1] => needs [2] => job )
    Simple array arithmetic:
    A more compact way of adding or subtracting the elements at identical keys...
    <?php
    function array_add($a1, $a2) { // ...
     // adds the values at identical keys together
     $aRes = $a1;
     foreach (array_slice(func_get_args(), 1) as $aRay) {
      foreach (array_intersect_key($aRay, $aRes) as $key => $val) $aRes[$key] += $val;
      $aRes += $aRay; }
     return $aRes; }
    function array_subtract($a1, $a2) { // ...
     // adds the values at identical keys together
     $aRes = $a1;
     foreach (array_slice(func_get_args(), 1) as $aRay) {
      foreach (array_intersect_key($aRay, $aRes) as $key => $val) $aRes[$key] -= $val;
      foreach (array_diff_key($aRay, $aRes) as $key => $val) $aRes[$key] = -$val; }
     return $aRes; }
    Example:
    $a1 = array(9, 8, 7);
    $a2 = array(1=>7, 6, 5);
    $a3 = array(2=>5, 4, 3);
    $aSum = array_add($a1, $a2, $a3);
    $aDiff = array_subtract($a1, $a2, $a3);
    // $aSum => [9, 15, 18, 9, 3]
    // $aDiff => [9, 1, -4, -9, -3]
    ?>
    To make a similar function, array_concatenate(), change only the first of the two '+=' in array_add() to '.='
    Csaba Gabor from Vienna
    When comparing arrays that have (some or all) element-values that are themselves array, then in PHP5 it seems that == and === are applied recursively - that is
     * two arrays satisfy == if they have the same keys, and the values at each key satisfy == for whatever they happen to be (which might be arrays);
     * two arrays satisfy === if they have the same keys, and the values at each key satisfy === for whatever (etc.).
    Which explains what happens if we compare two arrays of arrays of arrays of...
    Likewise, the corresponding inversions for != <> and !==.
    I've tested this to array-of-array-of-array, which seems fairly convincing. I've not tried it in PHP4 or earlier.
    The note about array comparison by Q1712 is not entirely accurate. 
    "The identical operator just requires that the keys are in the same order in both arrays:"
    This may have been the case in past (I cannot verify it). It requires that the keys are in the same order AND that the values match
    To extend that example
    <?php
     $a = array (0 => "apple", 1 => "banana");
     $b = array (1 => "banana", 0 => "apple");
     var_dump($a === $b); // prints bool(false) as well
     $b = array ("0" => "apple", "1" => "banana");
     var_dump($a === $b); // prints bool(true)
     $b = array ("0" => "apple-1", "1" => "banana-1");
     var_dump($a === $b); // prints bool(false)
    ?>
    
    hi just see one more example of union....
    <?php
    $a = array(1,2,3);
    $b = array(1,7,8,9,10);
    $c = $a + $b; // Union of $a and $b
    echo "Union of \$a and \$b: \n";
    //echo $c
    print_r($c);
    ?> 
    //output
    Union of $a and $b: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 9 [4] => 10 )
    This manual page doesn't mention < & co for arrays, but example 15-2 in 
      http://www.php.net/manual/en/language.operators.comparison.php
    goes to some lengths to explain how they work.
    Look out use + with array combine.
    $arr = array(1, 2, 3);
    $int=345;
    $arr=$arr+$int;
    Of couse,use + to combine array is easy and readable.
    But if one of the variable is not array type(like above code) ,that would make a PHP Fatal Error:
    PHP Fatal error: Unsupported operand types
    Maybe should do check before.
    The manual say ...
    "The + operator appends the right elements in the array from left, whereas duplicated keys are NOT overwritten"
    but ..
    $a = array("a" => 'A', "b" => 'B');
    $b = array("a" => 'A', "b" => 'B', "c" => 'C');
    $c = $a + $b // or $b + a is the same output; 
    echo '<pre>';
    print_r($c);
    echo '<pre>';
    //Output  for $a + b or $b + a
    Array (
      [a] => A
      [b] => B
      [c] => C
    )