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最近工作中碰到一个问题，用PHP将一个二维数组按照二维数组中的各个项中的某个特定字段值合并成一维数组，如果有重复则将重复的合并成二维数组，生成的二维数组的第一维的键是特定字段的值，二维的键可以是随机索引，也可以是其中的另一个字段的值。其实这个需求经常会在工作中碰到，只是碰到的时候一个有重复的就直接用之前的覆盖后面的或者用之后的覆盖之前的，这样很容易就可以处理了。很少碰到这种有一维数组又有二维数组的情况，先上代码：
$a = array(
0 => array('target_id' => '22', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '15261', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
1 => array('target_id' => '22', 'target_type' => '1', 'phone_type' => '2', 'extension_number' => '66002', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => '1',),
14 => array('target_id' => '22', 'target_type' => '1','phone_type' => '4', 'extension_number' => '56431', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
2 => array('target_id' => '24', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '54876', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => '1',),
3 => array('target_id' => '25', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '07143', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
13 => array('target_id' => '24', 'target_type' => '1', 'phone_type' => '0', 'extension_number' => '96949', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
4 => array('target_id' => '26', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '94755', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
5 => array('target_id' => '30', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '14171', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
6 => array('target_id' => '36', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '54876', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => '1',),
7 => array('target_id' => '42', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '31354', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
8 => array('target_id' => '43', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '66810', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
9 => array('target_id' => '45', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '34868', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
10 => array('target_id' => '50', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '79523', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
11 => array('target_id' => '149', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '59438', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
12 => array('target_id' => '806', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '14780', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
);
$target = array();
$temp = array();
foreach ($a as $val) {
if (!empty($target)) {
if (in_array($val['target_id'], array_keys($target))) {
if (!empty($temp[$val['target_id']])) {
$target[$val['target_id']] = null;
$target[$val['target_id']][$temp[$val['target_id']]['phone_type']] = $temp[$val['target_id']];
$temp[$val['target_id']] = null;
}
$target[$val['target_id']][$val['phone_type']] = $val;
} else {
$temp[$val['target_id']] = $val;
$target[$val['target_id']] = $val;
}
} else {
$temp[$val['target_id']] = $val;
$target[$val['target_id']] = $val;
}
}
var_dump($target);exit;
这个返回的结果形如：
array
22 =>
array
1 =>
array
'target_id' => string '22' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '15261' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
2 =>
array
'target_id' => string '22' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '2' (length=1)
'extension_number' => string '66002' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => string '1' (length=1)
4 =>
array
'target_id' => string '22' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '4' (length=1)
'extension_number' => string '56431' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
24 =>
array
1 =>
array
'target_id' => string '24' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '54876' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => string '1' (length=1)
0 =>
array
'target_id' => string '24' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '0' (length=1)
'extension_number' => string '96949' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
25 =>
array
'target_id' => string '25' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '07143' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
26 =>
array
'target_id' => string '26' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '94755' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
30 =>
array
'target_id' => string '30' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '14171' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
36 =>
array
'target_id' => string '36' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '54876' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => string '1' (length=1)
42 =>
array
'target_id' => string '42' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '31354' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
43 =>
array
'target_id' => string '43' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '66810' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
45 =>
array
'target_id' => string '45' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '34868' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
50 =>
array
'target_id' => string '50' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '79523' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
149 =>
array
'target_id' => string '149' (length=3)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '59438' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
806 =>
array
'target_id' => string '806' (length=3)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '14780' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
如果不想要生成的二维数组的key值，或者说再精简些，可以这样：
$a = array(
0 => array('target_id' => '22', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '15261', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
1 => array('target_id' => '22', 'target_type' => '1', 'phone_type' => '2', 'extension_number' => '66002', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => '1',),
14 => array('target_id' => '22', 'target_type' => '1','phone_type' => '4', 'extension_number' => '56431', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
2 => array('target_id' => '24', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '54876', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => '1',),
3 => array('target_id' => '25', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '07143', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
13 => array('target_id' => '24', 'target_type' => '1', 'phone_type' => '0', 'extension_number' => '96949', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
4 => array('target_id' => '26', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '94755', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
5 => array('target_id' => '30', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '14171', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
6 => array('target_id' => '36', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '54876', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => '1',),
7 => array('target_id' => '42', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '31354', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
8 => array('target_id' => '43', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '66810', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
9 => array('target_id' => '45', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '34868', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
10 => array('target_id' => '50', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '79523', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
11 => array('target_id' => '149', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '59438', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
12 => array('target_id' => '806', 'target_type' => '1', 'phone_type' => '1', 'extension_number' => '14780', 'phone_id' => '1', 'phone_number' => '4008285599', 'extension_special' => NULL,),
);
$target = array();
$temp = array();
foreach ($a as $val) {
if (!empty($target)) {
if (in_array($val['target_id'], array_keys($target))) {
if (!empty($temp[$val['target_id']])) {
$target[$val['target_id']] = null;
$target[$val['target_id']][] = $temp[$val['target_id']];
$temp[$val['target_id']] = null;
}
$target[$val['target_id']][] = $val;
} else {
$temp[$val['target_id']] = $val;
$target[$val['target_id']] = $val;
}
} else {
$temp[$val['target_id']] = $val;
$target[$val['target_id']] = $val;
}
}
var_dump($target);exit;
生成结果如：
array
22 =>
array
0 =>
array
'target_id' => string '22' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '15261' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
1 =>
array
'target_id' => string '22' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '2' (length=1)
'extension_number' => string '66002' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => string '1' (length=1)
2 =>
array
'target_id' => string '22' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '4' (length=1)
'extension_number' => string '56431' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
24 =>
array
0 =>
array
'target_id' => string '24' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '54876' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => string '1' (length=1)
1 =>
array
'target_id' => string '24' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '0' (length=1)
'extension_number' => string '96949' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
25 =>
array
'target_id' => string '25' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '07143' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
26 =>
array
'target_id' => string '26' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '94755' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
30 =>
array
'target_id' => string '30' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '14171' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
36 =>
array
'target_id' => string '36' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '54876' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => string '1' (length=1)
42 =>
array
'target_id' => string '42' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '31354' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
43 =>
array
'target_id' => string '43' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '66810' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
45 =>
array
'target_id' => string '45' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '34868' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
50 =>
array
'target_id' => string '50' (length=2)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '79523' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
149 =>
array
'target_id' => string '149' (length=3)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '59438' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
806 =>
array
'target_id' => string '806' (length=3)
'target_type' => string '1' (length=1)
'phone_type' => string '1' (length=1)
'extension_number' => string '14780' (length=5)
'phone_id' => string '1' (length=1)
'phone_number' => string '4008285599' (length=10)
'extension_special' => null
我这样写有些复杂，但是这种需求在网上很难搜到代码，所以自己贴一份，给大家审查下，看看还有什么更简单的方法实现，毕竟我的算法学的还是挺差的。欢迎指点讨论谢谢。
