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File Content: `VarCloner.php`

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\VarDumper\Cloner;

/**
 * @author Nicolas Grekas <p@tchwork.com>
 */
class VarCloner extends AbstractCloner
{
    private static $gid;
    private static $arrayCache = [];

    /**
     * {@inheritdoc}
     */
    protected function doClone($var)
    {
        $len = 1;                       // Length of $queue
        $pos = 0;                       // Number of cloned items past the minimum depth
        $refsCounter = 0;               // Hard references counter
        $queue = [[$var]];              // This breadth-first queue is the return value
        $hardRefs = [];                 // Map of original zval ids to stub objects
        $objRefs = [];                  // Map of original object handles to their stub object counterpart
        $objects = [];                  // Keep a ref to objects to ensure their handle cannot be reused while cloning
        $resRefs = [];                  // Map of original resource handles to their stub object counterpart
        $values = [];                   // Map of stub objects' ids to original values
        $maxItems = $this->maxItems;
        $maxString = $this->maxString;
        $minDepth = $this->minDepth;
        $currentDepth = 0;              // Current tree depth
        $currentDepthFinalIndex = 0;    // Final $queue index for current tree depth
        $minimumDepthReached = 0 === $minDepth; // Becomes true when minimum tree depth has been reached
        $cookie = (object) [];          // Unique object used to detect hard references
        $a = null;                      // Array cast for nested structures
        $stub = null;                   // Stub capturing the main properties of an original item value
                                        // or null if the original value is used directly

        if (!$gid = self::$gid) {
            $gid = self::$gid = md5(random_bytes(6)); // Unique string used to detect the special $GLOBALS variable
        }
        $arrayStub = new Stub();
        $arrayStub->type = Stub::TYPE_ARRAY;
        $fromObjCast = false;

        for ($i = 0; $i < $len; ++$i) {
            // Detect when we move on to the next tree depth
            if ($i > $currentDepthFinalIndex) {
                ++$currentDepth;
                $currentDepthFinalIndex = $len - 1;
                if ($currentDepth >= $minDepth) {
                    $minimumDepthReached = true;
                }
            }

            $refs = $vals = $queue[$i];
            foreach ($vals as $k => $v) {
                // $v is the original value or a stub object in case of hard references

                if (\PHP_VERSION_ID >= 70400) {
                    $zvalRef = ($r = \ReflectionReference::fromArrayElement($vals, $k)) ? $r->getId() : null;
                } else {
                    $refs[$k] = $cookie;
                    $zvalRef = $vals[$k] === $cookie;
                }

                if ($zvalRef) {
                    $vals[$k] = &$stub;         // Break hard references to make $queue completely
                    unset($stub);               // independent from the original structure
                    if (\PHP_VERSION_ID >= 70400 ? null !== $vals[$k] = $hardRefs[$zvalRef] ?? null : $v instanceof Stub && isset($hardRefs[spl_object_id($v)])) {
                        if (\PHP_VERSION_ID >= 70400) {
                            $v = $vals[$k];
                        } else {
                            $refs[$k] = $vals[$k] = $v;
                        }
                        if ($v->value instanceof Stub && (Stub::TYPE_OBJECT === $v->value->type || Stub::TYPE_RESOURCE === $v->value->type)) {
                            ++$v->value->refCount;
                        }
                        ++$v->refCount;
                        continue;
                    }
                    $vals[$k] = new Stub();
                    $vals[$k]->value = $v;
                    $vals[$k]->handle = ++$refsCounter;

                    if (\PHP_VERSION_ID >= 70400) {
                        $hardRefs[$zvalRef] = $vals[$k];
                    } else {
                        $refs[$k] = $vals[$k];
                        $h = spl_object_id($refs[$k]);
                        $hardRefs[$h] = &$refs[$k];
                        $values[$h] = $v;
                    }
                }
                // Create $stub when the original value $v cannot be used directly
                // If $v is a nested structure, put that structure in array $a
                switch (true) {
                    case null === $v:
                    case \is_bool($v):
                    case \is_int($v):
                    case \is_float($v):
                        continue 2;
                    case \is_string($v):
                        if ('' === $v) {
                            continue 2;
                        }
                        if (!preg_match('//u', $v)) {
                            $stub = new Stub();
                            $stub->type = Stub::TYPE_STRING;
                            $stub->class = Stub::STRING_BINARY;
                            if (0 <= $maxString && 0 < $cut = \strlen($v) - $maxString) {
                                $stub->cut = $cut;
                                $stub->value = substr($v, 0, -$cut);
                            } else {
                                $stub->value = $v;
                            }
                        } elseif (0 <= $maxString && isset($v[1 + ($maxString >> 2)]) && 0 < $cut = mb_strlen($v, 'UTF-8') - $maxString) {
                            $stub = new Stub();
                            $stub->type = Stub::TYPE_STRING;
                            $stub->class = Stub::STRING_UTF8;
                            $stub->cut = $cut;
                            $stub->value = mb_substr($v, 0, $maxString, 'UTF-8');
                        } else {
                            continue 2;
                        }
                        $a = null;
                        break;

                    case \is_array($v):
                        if (!$v) {
                            continue 2;
                        }
                        $stub = $arrayStub;

                        if (\PHP_VERSION_ID >= 80100) {
                            $stub->class = array_is_list($v) ? Stub::ARRAY_INDEXED : Stub::ARRAY_ASSOC;
                            $a = $v;
                            break;
                        }

                        $stub->class = Stub::ARRAY_INDEXED;

                        $j = -1;
                        foreach ($v as $gk => $gv) {
                            if ($gk !== ++$j) {
                                $stub->class = Stub::ARRAY_ASSOC;
                                $a = $v;
                                $a[$gid] = true;
                                break;
                            }
                        }

                        // Copies of $GLOBALS have very strange behavior,
                        // let's detect them with some black magic
                        if (isset($v[$gid])) {
                            unset($v[$gid]);
                            $a = [];
                            foreach ($v as $gk => &$gv) {
                                if ($v === $gv && (\PHP_VERSION_ID < 70400 || !isset($hardRefs[\ReflectionReference::fromArrayElement($v, $gk)->getId()]))) {
                                    unset($v);
                                    $v = new Stub();
                                    $v->value = [$v->cut = \count($gv), Stub::TYPE_ARRAY => 0];
                                    $v->handle = -1;
                                    if (\PHP_VERSION_ID >= 70400) {
                                        $gv = &$a[$gk];
                                        $hardRefs[\ReflectionReference::fromArrayElement($a, $gk)->getId()] = &$gv;
                                    } else {
                                        $gv = &$hardRefs[spl_object_id($v)];
                                    }
                                    $gv = $v;
                                }

                                $a[$gk] = &$gv;
                            }
                            unset($gv);
                        } else {
                            $a = $v;
                        }
                        break;

                    case \is_object($v):
                        if (empty($objRefs[$h = spl_object_id($v)])) {
                            $stub = new Stub();
                            $stub->type = Stub::TYPE_OBJECT;
                            $stub->class = \get_class($v);
                            $stub->value = $v;
                            $stub->handle = $h;
                            $a = $this->castObject($stub, 0 < $i);
                            if ($v !== $stub->value) {
                                if (Stub::TYPE_OBJECT !== $stub->type || null === $stub->value) {
                                    break;
                                }
                                $stub->handle = $h = spl_object_id($stub->value);
                            }
                            $stub->value = null;
                            if (0 <= $maxItems && $maxItems <= $pos && $minimumDepthReached) {
                                $stub->cut = \count($a);
                                $a = null;
                            }
                        }
                        if (empty($objRefs[$h])) {
                            $objRefs[$h] = $stub;
                            $objects[] = $v;
                        } else {
                            $stub = $objRefs[$h];
                            ++$stub->refCount;
                            $a = null;
                        }
                        break;

                    default: // resource
                        if (empty($resRefs[$h = (int) $v])) {
                            $stub = new Stub();
                            $stub->type = Stub::TYPE_RESOURCE;
                            if ('Unknown' === $stub->class = @get_resource_type($v)) {
                                $stub->class = 'Closed';
                            }
                            $stub->value = $v;
                            $stub->handle = $h;
                            $a = $this->castResource($stub, 0 < $i);
                            $stub->value = null;
                            if (0 <= $maxItems && $maxItems <= $pos && $minimumDepthReached) {
                                $stub->cut = \count($a);
                                $a = null;
                            }
                        }
                        if (empty($resRefs[$h])) {
                            $resRefs[$h] = $stub;
                        } else {
                            $stub = $resRefs[$h];
                            ++$stub->refCount;
                            $a = null;
                        }
                        break;
                }

                if ($a) {
                    if (!$minimumDepthReached || 0 > $maxItems) {
                        $queue[$len] = $a;
                        $stub->position = $len++;
                    } elseif ($pos < $maxItems) {
                        if ($maxItems < $pos += \count($a)) {
                            $a = \array_slice($a, 0, $maxItems - $pos, true);
                            if ($stub->cut >= 0) {
                                $stub->cut += $pos - $maxItems;
                            }
                        }
                        $queue[$len] = $a;
                        $stub->position = $len++;
                    } elseif ($stub->cut >= 0) {
                        $stub->cut += \count($a);
                        $stub->position = 0;
                    }
                }

                if ($arrayStub === $stub) {
                    if ($arrayStub->cut) {
                        $stub = [$arrayStub->cut, $arrayStub->class => $arrayStub->position];
                        $arrayStub->cut = 0;
                    } elseif (isset(self::$arrayCache[$arrayStub->class][$arrayStub->position])) {
                        $stub = self::$arrayCache[$arrayStub->class][$arrayStub->position];
                    } else {
                        self::$arrayCache[$arrayStub->class][$arrayStub->position] = $stub = [$arrayStub->class => $arrayStub->position];
                    }
                }

                if (!$zvalRef) {
                    $vals[$k] = $stub;
                } elseif (\PHP_VERSION_ID >= 70400) {
                    $hardRefs[$zvalRef]->value = $stub;
                } else {
                    $refs[$k]->value = $stub;
                }
            }

            if ($fromObjCast) {
                $fromObjCast = false;
                $refs = $vals;
                $vals = [];
                $j = -1;
                foreach ($queue[$i] as $k => $v) {
                    foreach ([$k => true] as $gk => $gv) {
                    }
                    if ($gk !== $k) {
                        $vals = (object) $vals;
                        $vals->{$k} = $refs[++$j];
                        $vals = (array) $vals;
                    } else {
                        $vals[$k] = $refs[++$j];
                    }
                }
            }

            $queue[$i] = $vals;
        }

        foreach ($values as $h => $v) {
            $hardRefs[$h] = $v;
        }

        return $queue;
    }
}
Name	Size	Permission
AbstractCloner.php	21171 bytes	0644
ClonerInterface.php	523 bytes	0644
Cursor.php	1081 bytes	0644
Data.php	13940 bytes	0644
DumperInterface.php	1852 bytes	0644
Stub.php	1556 bytes	0644
VarCloner.php	13787 bytes	0644
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File Content: VarCloner.php

File Content: `VarCloner.php`
