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@ 2019-03-05T22:39:55Z

<?php
function wrap_js($js) {
    $confirm_text = "It will not be possible to modify your responses anymore if you continue.\\n\\nAre you sure you want to continue?";
    $new_js_start = 'if( window.confirm("' . $confirm_text . '") ) { ';
    $new_js_end = ' } else { event.preventDefault(); }';
    return $new_js_start . $js . $new_js_end;
}
$html = "<input type='submit' id='gform_submit_button_4' class='gform_button button' value='Envoyer'  onclick='/* Lots of JS */' onkeypress='/* Lots of JS */' />";
$doc = new DOMDocument();
$doc->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($doc);
foreach ($xpath->query("//input[@type='submit']") as $submit_input) {
    foreach (['onclick', 'onkeypress'] as $attribute) {
        if (($js = $submit_input->getAttribute($attribute)) != '') {
            $submit_input->setAttribute($attribute, wrap_js($js));
        }
    }
}
echo $doc->saveHTML();

Output for git.master, git.master_jit, rfc.property-hooks: <input type="submit" id="gform_submit_button_4" class="gform_button button" value="Envoyer" onclick='if( window.confirm("It will not be possible to modify your responses anymore if you continue.\n\nAre you sure you want to continue?") ) { /* Lots of JS */ } else { event.preventDefault(); }' onkeypress='if( window.confirm("It will not be possible to modify your responses anymore if you continue.\n\nAre you sure you want to continue?") ) { /* Lots of JS */ } else { event.preventDefault(); }'>

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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