Check files for Unicode U+00A0 No-Break Space

charcheck.php

<?php

// Find invisible non-breaking spaces in source code
// which can cause errors in PHP and JavaScript.
//
// see: http://www.strehle.de/tim/weblog/archives/2013/02/26/1563
//
// Usage: 
//   php charcheck.php path/to/*.php
// or:
//   find path/to -name '*.php' | php charcheck.php -


function checkFile($filename)
{    
    // "| ": space after pipe (c2 a0)
    $check = chr(194) . chr(160);

    $lines = file($filename);
    
    $matches = array();
    
    foreach ($lines as $lineno => $line)
    {
        if (strpos($line, $check) !== false)
        {
            $matches[ ] = ($lineno + 1);
        }
    }

    if (count($matches) > 0)
    {
        printf("%s %s\n", $filename, implode(',', $matches));
    }
}


if ($argv[ 1 ] === '-')
{
    while (! feof(STDIN))
    {
        $filename = trim(fgets(STDIN));
        
        if ($filename !== '')
        {
            checkFile($filename);
        }
    }
}
else
{
    for ($i = 1; $i < $argc; $i++)
    {
        checkFile($argv[ $i ]);
    }
}

?>