PHP incdec Examples

Example #1

File: post-increment_and_decrement_integer_edge_cases.php Project: badlamer/hhvm

    echo "--- start incdecrev ---\n";
    $y = $x;
    var_dump($x);
    ++$x;
    var_dump($x);
    ++$x;
    var_dump($x);
    --$x;
    var_dump($x);
    --$x;
    var_dump($x);
    // equivalent code using -=/+= instead of --/++.
    var_dump($y);
    $y += 1;
    var_dump($y);
    $y += 1;
    var_dump($y);
    $y -= 1;
    var_dump($y);
    $y -= 1;
    var_dump($y);
    echo "--- end incdecrev ---\n";
}
$i32 = 1 << 31;
// if this is negative, we have a 32-bit int
$i64 = 1 << 63;
// same as $i32 for 32-bit int; otherwise, is 64-bit
$IntMin = $i32 < 0 ? $i32 : $i64;
$IntMax = ~$IntMin;
incdec($IntMin);
incdecrev($IntMax);

Example #2

File: post-increment_and_decrement.php Project: jeremyadoux/hhvm

incdec("543J");
incdecrev("543J9");
incdec("543J9");
//*/
///*
// strings ending in non-alphanumeric characters
incdec("&");
incdecrev("&");
incdec("83&");
incdecrev("83&");
incdec("83&8");
incdecrev("83&8");
incdec("83&Z8");
incdecrev("83&Z8");
incdec("83&z8");
incdecrev("83&z8");
incdec("&28");
incdecrev("&28");
incdec("&98");
incdecrev("&98");
//*/
///*
$x = "aa";
var_dump($x);
var_dump(--$x);
var_dump(--$x);
$x = "zza";
var_dump($x);
var_dump(--$x);
var_dump(--$x);
//*/