Symfony error in Dynamic Form yii2

Question

I did a composer update in my yii2 project and after that I'm getting syntax error, unexpected '?' in /vendor/symfony folder in several places dom-crawler etc. in yii2.

I'm only getting error while I'm opening form with yii2 dynamic form. The other view files are working fine.

composer.json file - 
{
    "name": "yiisoft/yii2-app-advanced",
    "description": "Yii 2 Advanced Project Template",
    "keywords": ["yii2", "framework", "advanced", "project template"],
    "homepage": "http://www.yiiframework.com/",
    "type": "project",
    "license": "BSD-3-Clause",
    "support": {
        "issues": "https://github.com/yiisoft/yii2/issues?state=open",
        "forum": "http://www.yiiframework.com/forum/",
        "wiki": "http://www.yiiframework.com/wiki/",
        "irc": "irc://irc.freenode.net/yii",
        "source": "https://github.com/yiisoft/yii2"
    },
    "minimum-stability": "stable",
    "require": {
        "php": ">=5.4.0",
        "yiisoft/yii2": ">=2.0.6",
        "yiisoft/yii2-bootstrap": "*",
        "yiisoft/yii2-swiftmailer": "*",
        "kartik-v/yii2-widget-sidenav": "*",
        "kartik-v/yii2-grid": "*",
        "2amigos/yii2-date-picker-widget": "~1.0",
        "kartik-v/yii2-widget-select2": "@dev",
        "reportico/yii2-reportico": "dev-master",
        "miloschuman/yii2-highcharts-widget": "*",
        "kartik-v/dependent-dropdown": "dev-master",
        "kartik-v/yii2-widget-depdrop": "@dev",
        "kartik-v/yii2-date-range": "*",
        "kartik-v/yii2-widget-activeform": "@dev",
        "yiisoft/yii2-jui": "^2.0",
        "kartik-v/yii2-widget-datetimepicker": "*",
        "kartik-v/yii2-widget-datepicker": "@dev",
        "kartik-v/yii2-field-range": "*",
        "wbraganca/yii2-dynamicform": "*",
        "yiisoft/yii2-debug": "^2.0",
        "mpdf/mpdf": "^6.1",
        "kartik-v/yii2-mpdf": "*",
        "beaten-sect0r/yii2-db-manager": "*",
        "spanjeta/yii2-backup": "*",
        "warrence/yii2-kartikgii": "dev-master",
        "kartik-v/yii2-export": "*"
    },
    "require-dev": {
        "yiisoft/yii2-codeception": "*",
        "yiisoft/yii2-gii": "*",
        "yiisoft/yii2-faker": "*"
    },
    "config": {
        "process-timeout": 1800
    },
    "extra": {
        "asset-installer-paths": {
            "npm-asset-library": "vendor/npm",
            "bower-asset-library": "vendor/bower"
        }
    }
}

php version - 7.0.2

I tried to remove vendor directory, clear cache and composer install again with same result.

just remove the vendor directory and run composer install again — Muhammad Omer Aslam
– Muhammad Omer Aslam, Commented May 13, 2018 at 15:39
it uses symfony/dom-crawler and "symfony/css-selector": "~2.8|~3.0", that might be having trouble. you can verify by using composer show -i on project root, to look what is installed and which version — Muhammad Omer Aslam
– Muhammad Omer Aslam, Commented May 13, 2018 at 15:41
You're probably trying to use packages that require PHP 7.1 on pre-7.1 environment. Please share your composer.json content and your PHP version. — rob006
– rob006, Commented May 13, 2018 at 15:51

rob006 · Accepted Answer · 2018-05-13 16:06:43Z

2

First, you should lock your PHP version in composer.json config:

"config": {
    "platform": {
        "php": "7.0"
    }
},

It looks like you're using different PHP version for installing packages, so Composer is installing packages that require PHP 7.1. Adding this will force Composer to install versions for PHP 7.0.

Second, you should really avoid constraints like >=2.0.6, @dev or *. This will allow Composer to upgrade packages to new major version which may (and probably will) introduce backward compatibility break. So even if package will work on PHP 7.0, it may break your app.

answered May 13, 2018 at 16:06

rob006

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3 Comments

Alias Over a year ago

Hi, the colon after platform is shown as pink mark in sublime text.. And secondly, do we need a composer update after it.

rob006 Over a year ago

Yes, you need to run composer update after this change. You may even need to delete vendor directory and composer.lock before update - composer-asset-plugin has known bug with downgrading packages.

Phemelo Khetho Over a year ago

You are a lifesaver. I spent more than 4 hours trying to find a way around this error until I came to your answer. Thanks, Worked like a miracle.

BINAY THAPA MAGAR · Accepted Answer · 2018-08-07 02:42:36Z

0

Try upgrading your php version. It worked with me.

answered Aug 7, 2018 at 2:42

BINAY THAPA MAGAR

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2 Comments

CertainPerformance Over a year ago

From what, to what? Please explain

BINAY THAPA MAGAR Over a year ago

I'm getting syntax error, unexpected '?' in /vendor/symfony folder in several places dom-crawler etc. in yii2. His/Her question was somethimg like this.

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