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+ <?php
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+ var_dump ( file_exists ('..\..\..\hi.txt ' ) );
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+ var_dump ( file_exists ("file_exists.php " ) );
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+ var_dump ( file_exists ("test.php " ) );
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+ var_dump ( file_exists ("dir \\hi.txt " ) );
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+ var_dump ( file_exists (".. \\dir \\hi.txt " ) );
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+ var_dump ( file_exists (".. \\.. \\.. \\dir \\hi.txt " ) );
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+ var_dump ( file_exists ("c: \\dir \\hi.txt " ) );
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+ var_dump ( file_exists ("e: \\hi.txt " ) );
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+
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+ // /home/user/file_exists.php
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+ // c:\user\hi.txt
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+
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+ var_dump ("a \n" );
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+ var_dump ("a \\n " );
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+
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+ var_dump ("a \t" );
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+ var_dump ("a \\t " );
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+ var_dump ("a \\b " );
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+ var_dump ("a\b " );
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+
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+ var_dump ("\' " );
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+ var_dump ('\n ' );
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+ var_dump ('\t ' );
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+ // var_dump("a\\" . "t");
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+
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+ $ age = 20 ;
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+ print $ age . ", " . $ age . "\n" ;
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+ print "$ age " ;
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+ print '$age ' ;
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+
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+ $ age = 100 ;
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+ var_dump ($ age );
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+ var_dump ("$ age " );
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+
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+ // Error: var_dump('\');
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+ var_dump ('\\' );
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+ var_dump ('\\\\' );
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+
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+ var_dump ('c:\test\file.txt ' );
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+ // Error: var_dump('c:\');
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+ var_dump ('c: \\' );
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+
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+ var_dump (file_exists (null ));
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