https://stackoverflow.com/questions/21504716
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RussianArray borrowed from http://www.php.net/manual/en/reserved.keywords.php
You could easily modify it to work for the predefined constants array.
This works.
<?php
$keywords = array('__halt_compiler', 'abstract', 'and', 'array', 'as', 'break', 'callable', 'case', 'catch', 'class', 'clone', 'const', 'continue', 'declare', 'default', 'die', 'do', 'echo', 'else', 'elseif', 'empty', 'enddeclare', 'endfor', 'endforeach', 'endif', 'endswitch', 'endwhile', 'eval', 'exit', 'extends', 'final', 'for', 'foreach', 'function', 'global', 'goto', 'if', 'implements', 'include', 'include_once', 'instanceof', 'insteadof', 'interface', 'isset', 'list', 'namespace', 'new', 'or', 'print', 'private', 'protected', 'public', 'require', 'require_once', 'return', 'static', 'switch', 'throw', 'trait', 'try', 'unset', 'use', 'var', 'while', 'xor');
$predefined_constants = array('__CLASS__', '__DIR__', '__FILE__', '__FUNCTION__', '__LINE__', '__METHOD__', '__NAMESPACE__', '__TRAIT__');
$checkWord='break'; // <- the word to check for.
if (in_array($checkWord, $keywords)) {
echo "Found.";
}
else {
echo "Not found.";
}
?>
You could also implement this in conjunction with a form by replacing:
$checkWord='break';
with
$checkWord=$_POST['checkWord'];
I.e.:
<?php
if(isset($_POST['submit'])){
$keywords = array('__halt_compiler', 'abstract', 'and', 'array', 'as', 'break', 'callable', 'case', 'catch', 'class', 'clone', 'const', 'continue', 'declare', 'default', 'die', 'do', 'echo', 'else', 'elseif', 'empty', 'enddeclare', 'endfor', 'endforeach', 'endif', 'endswitch', 'endwhile', 'eval', 'exit', 'extends', 'final', 'for', 'foreach', 'function', 'global', 'goto', 'if', 'implements', 'include', 'include_once', 'instanceof', 'insteadof', 'interface', 'isset', 'list', 'namespace', 'new', 'or', 'print', 'private', 'protected', 'public', 'require', 'require_once', 'return', 'static', 'switch', 'throw', 'trait', 'try', 'unset', 'use', 'var', 'while', 'xor');
$predefined_constants = array('__CLASS__', '__DIR__', '__FILE__', '__FUNCTION__', '__LINE__', '__METHOD__', '__NAMESPACE__', '__TRAIT__');
$checkWord=$_POST['checkWord'];
if (in_array($checkWord, $keywords)) {
echo "FOUND!!";
}
else {
echo "Not found.";
}
}
?>
<form method="post" action="">
Enter word to check:
<input type="text" name="checkWord">
<br>
<input type="submit" name="submit" value="Check for reserved word">
</form>
A different version using both arrays set inside a form.
It could stand for some polishing up, but it does the trick
<?php
if(isset($_POST['submit'])){
$keywords = array('__halt_compiler', 'abstract', 'and', 'array', 'as', 'break', 'callable', 'case', 'catch', 'class', 'clone', 'const', 'continue', 'declare', 'default', 'die', 'do', 'echo', 'else', 'elseif', 'empty', 'enddeclare', 'endfor', 'endforeach', 'endif', 'endswitch', 'endwhile', 'eval', 'exit', 'extends', 'final', 'for', 'foreach', 'function', 'global', 'goto', 'if', 'implements', 'include', 'include_once', 'instanceof', 'insteadof', 'interface', 'isset', 'list', 'namespace', 'new', 'or', 'print', 'private', 'protected', 'public', 'require', 'require_once', 'return', 'static', 'switch', 'throw', 'trait', 'try', 'unset', 'use', 'var', 'while', 'xor');
$predefined_constants = array('__CLASS__', '__DIR__', '__FILE__', '__FUNCTION__', '__LINE__', '__METHOD__', '__NAMESPACE__', '__TRAIT__');
$checkWord=$_POST['checkWord'];
$checkconstant=$_POST['checkconstant'];
if (in_array($checkWord, $keywords)) {
echo "<b>Reserved word FOUND!!</b>";
echo "\n";
}
else {
echo "Reserved word not found or none entered.";
}
if (in_array($checkconstant, $predefined_constants)) {
echo "<b>Constant word FOUND!!</b>";
echo "\n";
}
else {
echo "Constant not found or none entered.";
}
}
?>
<form method="post" action="">
Enter reserved word to check:
<input type="text" name="checkWord">
Enter constant word to check:
<input type="text" name="checkconstant">
<br><br>
<input type="submit" name="submit" value="Check for reserved words">
<input type="reset" value="Reset" name="reset">
</form>
