Use AstKit extension to look at the AST from a given PHP file.

README.md

Usage

• install AstKit extension (requires PHP 7.0+)

  $ pecl install astkit

• enable AstKit for PHP

  # in php.ini
  extension=astkit.so
  

• run the script on a file

  $ php ast_explore.php /path/to/file.php

ast_explore.php

#!/usr/bin/env php
<?php

if ($argc < 2) {
    echo "Usage: php {$argv[0]} <file>" . PHP_EOL;
    exit(1);
}

function debug($msg, $depth) {
    echo str_repeat(" ", $depth*2) . $msg . PHP_EOL;
}

function browseAst($ast, $depth = 0) {
    debug(sprintf(
        "%s (%d), line %d",
        AstKit::kindName($ast->getId()),
        $ast->getId(),
        $ast->getLine()
    ), $depth);

    for ($i = 0; $i < $ast->numChildren(); $i++) {
        // stackdriver_debugger();
        $child = $ast->getChild($i);
        if (is_string($child)) {
            debug("command: $child", $depth + 1);
        } elseif (is_int($child)) {
            debug("int: $child", $depth + 1);
        } elseif (is_float($child)) {
            debug("float: $child", $depth + 1);
        } elseif(is_null($child)) {
            debug("child #{$i} is null!", $depth + 1);
        } else {
            browseAst($child, $depth + 1);
        }
    }
}

$ast = AstKit::parseFile($argv[1]);
browseAst($ast);