Online PHP editor | output for q8Al9

@ 2019-10-24T23:59:32Z

<?php

$results = [];
foreach ([
    '',
    'a',
] as $str) {
    $strx = var_export($str, true);
    foreach ([
        0,
        5,
    ] as $num) {
        $results["$strx ?: $num"] = $str ?: $num;
        $results["$strx ?: $num ?: false"] = $str ?: $num;
        $results["($strx ?: $num) ?: false"] = $str ?: $num;
        $results["$strx ?: ($num ?: false)"] = $str ?: $num;
        $results["$strx ? ($num ?: false) : false"] = $str ? ($num ?: false) : false;
        $results["$strx ? $num ?: false : false"] = $str ? $num ?: false : false;
    }
}


foreach ($results as $formula => $result) {
    print var_export($result, true) . ' === ' . $formula . "\n";
}

Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: 0 === '' ?: 0 0 === '' ?: 0 ?: false 0 === ('' ?: 0) ?: false 0 === '' ?: (0 ?: false) false === '' ? (0 ?: false) : false false === '' ? 0 ?: false : false 5 === '' ?: 5 5 === '' ?: 5 ?: false 5 === ('' ?: 5) ?: false 5 === '' ?: (5 ?: false) false === '' ? (5 ?: false) : false false === '' ? 5 ?: false : false 'a' === 'a' ?: 0 'a' === 'a' ?: 0 ?: false 'a' === ('a' ?: 0) ?: false 'a' === 'a' ?: (0 ?: false) false === 'a' ? (0 ?: false) : false false === 'a' ? 0 ?: false : false 'a' === 'a' ?: 5 'a' === 'a' ?: 5 ?: false 'a' === ('a' ?: 5) ?: false 'a' === 'a' ?: (5 ?: false) 5 === 'a' ? (5 ?: false) : false 5 === 'a' ? 5 ?: false : false

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