可以通过多种方式执行此任务。这只是适用于您的示例输入数组的一种方法。有关说明，请参阅内联 cmets。
代码：(Demo)
$array=['cses_id'=>'54','ccc_id'=>'1157','csh_id'=>'206','css_id'=>'441,442','sai_id'=>'12213'];
$count=0;
// convert each comma-separated value to an array of values & store the max comma count
$multi=array_map(function($v)use(&$count){$count=max($count,substr_count($v,',')); return explode(',',$v);},$array);
++$count; // increment to know how many "columns" of values exist
for($col=0; $col<$count; ++$col){
$temp=[];
foreach($multi as $key=>&$val){
$temp[$key]=(sizeof($val)>1?array_shift($val):current($val)); // take off the front element until only one is left (and repeat the use of final value)
}
$result[]=$temp; // store this batch of columnar data
}
var_export($result);
输出：
array (
0 =>
array (
'cses_id' => '54',
'ccc_id' => '1157',
'csh_id' => '206',
'css_id' => '441',
'sai_id' => '12213',
),
1 =>
array (
'cses_id' => '54',
'ccc_id' => '1157',
'csh_id' => '206',
'css_id' => '442',
'sai_id' => '12213',
),
)
这是实现相同结果的另一种方法：(Demo)
$array=['cses_id'=>'54','ccc_id'=>'1157','csh_id'=>'206','css_id'=>'441,442','sai_id'=>'12213'];
do {
$stop=true; // default to stop after each iteration
$temp=[]; // clear the $temp variable
foreach($array as $key=>&$val){ // iterate associate array, modify $val by reference
$parts=explode(',',$val,2); // break the value on the first comma only
$temp[$key]=$parts[0]; // associatively store first value to the temp array
if(sizeof($parts)>1){ // if there was a comma this iteration...
$stop=false; // tell the loop to do another iteration
$val=$parts[1]; // modify $array by overwriting $val with the remaining comma-separated value
}
}
$result[]=$temp; // this this iteration's temporary array in the result array
} while(!$stop); // iterate while there are any commas still in the any of the elements
var_export($result); // print to screen