Static variable assignment problem?

$a = 100;
static $b = $a;
Echo $b;

Why can't static variables be assigned to this value?

Reply to discussion (solution)

$b = 100;
static $a;
$a = $b;
echo $a;

Is that correct?

A static property can only be initialized to a character value or a constant and cannot use an expression.
You can static $a = ' a ', or $a=100 but cannot perform assignment operations or other expressions.

Static variables created during PHP precompilation
Therefore, you cannot assign a value to a normal variable because the normal variable is created at the subsequent run time

To put it bluntly, you can't assign a nonexistent value to a static variable.

A static variable cannot assign a value directly to another variable. After the declaration, it is not possible.

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