Viewing file:  multi_array_access.php (991 B) -rw-rw-r--
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<?php
// This is a very strange example, in which a data is changed by reading it.
// The var_dump () before the line marked * will print a different result
// than the line the *, even though the data in p0 is only read in
// between. This is because the reference assignment creates an array from
// NULL in the variable $p. This example shows that
// $y = $x[$p[0]];
// cannot be translated into
// $t0 =& $p[0];
// $t1 =& $x[$t0];
// $y =& $t1;
// Note the change in $p
$p = NULL;
var_dump ($p);
$t =& $p[0];
var_dump ($p);
// It only happens with references
$p = NULL;
var_dump ($p);
$t = $p[0];
var_dump ($p);
// The array doesnt need to be NULL, just missing the index.
$p = array (1 => 17);
var_dump ($p);
$t =& $p[2];
var_dump ($p);
// The array doesnt need to be NULL, just missing the index.
$p = array (1 => 17);
var_dump ($p);
$t = $p[2];
var_dump ($p);
$x = array (4 => "d");
var_dump ($x);
$y = $x[$p[0]];
var_dump ($x);
?>
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