A strange problem occurred in the call array

$_PX = (int) $px-1; echo ">-$_px-<";
echo erlist [54][' Paperid ']; echo "| | |";

If it is written here erlist [54][' Paperid ']; You can print out the values.

If write erlist[$_px][' Paperid ']; The value is 0, it seems to be gone.

Excuse me, why is this?

What should I write about it?

Reply to discussion (solution)

echo erlist [54][' Paperid ']; value 1234

------
But
$_PX = 55;
$_PX = $px-1;
echo erlist [$_px][' Paperid ']; the value is 0.

echo erlist [54][' Paperid ']; value 1234

------
But
$_PX = 55;
$_PX = $_px-1;
echo erlist [$_px][' Paperid ']; the value is 0.

erlist = Array (), erlist [si] = array (    ' paperid ' = + 1234); echo erlist [54][' Paperid ']. '
'; $_px = 55;$_px = $_px-1;echo erlist [$_px][' Paperid '];

Is output 1234, no problem.

