find square images in a folder and list number per pixel width size and also which files

jpeg_squares.php

<?php
// find square jpeg images

$cmd = 'find . -type f -iname "*.jp*" -print';

$files = cmd_execute($cmd);
$counts = [];
$by_size = [];
foreach ($files as $k => $path) {
  $data = getimagesize($path);
  // ignore non-jpegs
  if (empty($data['mime']) || 2 !== $data[2] || 'image/jpeg' !== $data['mime']) continue;
  $width = $data[0];
  $height = $data[1];
  // only take squares
  if (!($width == $height)) {
    continue;
  }
  $counts[$width]++;
  $by_size[$width][] = $path;
  //echo "$path\n";
  //print_r($data);
  unset($files[$k]);
}

echo "\nSummary by size:";

ksort($counts);
print_r($counts);

ksort($by_size);
print_r($by_size);
exit;

/**
 * Execute a command and return streams as an array of
 * stdin, stdout, stderr
 *
 * @param  string $cmd command to execute
 * @return mixed array $streams | boolean false if failure
 * @see    https://secure.php.net/manual/en/function.proc-open.php
 */
function shell_execute($cmd)
{
    $process = proc_open(
        $cmd,
        [
        ['pipe', 'r'],
        ['pipe', 'w'],
        ['pipe', 'w']
        ],
        $pipes
    );
    if (is_resource($process)) {
        $streams = [];
        foreach ($pipes as $p => $v) {
            $streams[] = stream_get_contents($pipes[$p]);
        }
        proc_close($process);
        return [
            'stdin'  => $streams[0],
            'stdout' => $streams[1],
            'stderr' => $streams[2]
        ];
    }
    return false;
}
/**
 * Execute a command and return output of stdout or throw exception of stderr
 *
 * @param  string $cmd command to execute
 * @param  boolean $split split returned results? default on newline
 * @param  string $exp regular expression to preg_split to split on
 * @return mixed string $stdout | Exception if failure
 * @see    shell_execute($cmd)
 */
function cmd_execute($cmd, $split = true, $exp = "/\n/") {
    $result = shell_execute($cmd);
    if (!empty($result['stderr'])) {
        throw new Exception($result['stderr']);
    }
    $data = $result['stdout'];
    if (empty($split) || empty($exp) || empty($data)) {
        return $data;
    }
    return preg_split($exp, $data);
}