Just searched for the [docs][1], and found [this][2]:

Containment Operator:
The **in** operator performs containment test.
It returns true if the left operand is contained in the right:

    {# returns true #}
    
    {{ 1 in [1, 2, 3] }}
    
    {{ &#39;cd&#39; in &#39;abcde&#39; }}

  [1]: http://twig.sensiolabs.org/documentation
  [2]: http://twig.sensiolabs.org/doc/templates.html#containment-operator

I know in C++11 they added the feature to initialize a variable to zero as such 

    double number = {}; // number = 0
    int data{};  // data = 0
    
Is there a similar way to initialize a `std::vector` of a fixed length to all zero&#39;s?

initialize a vector to zeros C++/C++11

I want to create a file from within a python script that is executable.

    import os
    import stat
    os.chmod(&#39;somefile&#39;, stat.S_IEXEC)

it appears `os.chmod` doesn&#39;t &#39;add&#39; permissions the way unix `chmod` does. With the last line commented out, the file has the filemode `-rw-r--r--`, with it not commented out, the file mode is `---x------`. How can I just add the `u+x` flag while keeping the rest of the modes intact?

How do you do a simple &quot;chmod +x&quot; from within python?

I want to find substring of the string or check if there is no such substring using Twig. On the words, I need analogue of &#39;strstr&#39; or &#39;strpos&#39; in php.
I googled and searched this issue in stackoverflow but nothing found. Does someone know how to solve this problem?

Find substring in the string in TWIG

<p>I want to find substring of the string or check if there is no such substring using Twig. On the words, I need analogue of 'strstr' or 'strpos' in php.
I googled and searched this issue in stackoverflow but nothing found. Does someone know how to solve this problem?</p>


I&#39;m trying to download a file when a user clicks on download link.

In Controller:

        $response = new Response();
        $response-&gt;headers-&gt;set(&#39;Content-type&#39;, &#39;application/octect-stream&#39;);
        $response-&gt;headers-&gt;set(&#39;Content-Disposition&#39;, sprintf(&#39;attachment; filename=&quot;%s&quot;&#39;, $filename));
        $response-&gt;headers-&gt;set(&#39;Content-Length&#39;, filesize($filename));

        return $response;

This is opening the dialog box to save the file, but it says the file is 0 bytes.
And changing it to:

            $response = new Response();
            $response-&gt;headers-&gt;set(&#39;Content-type&#39;, &#39;application/octect-stream&#39;);
            $response-&gt;headers-&gt;set(&#39;Content-Disposition&#39;, sprintf(&#39;attachment; filename=&quot;%s&quot;&#39;, $filename));
            $response-&gt;headers-&gt;set(&#39;Content-Length&#39;, filesize($filename));
            $response-&gt;headers-&gt;set(&#39;Content-Transfer-Encoding&#39;, &#39;binary&#39;);
            $response-&gt;setContent(readfile($filename));

            return $response;

I get a bunch of weird characters instead of the file download dialog box.

Finally, switching the &quot;setContent&quot; line to:

        $response-&gt;setContent(file_get_contents($filename));

It returns a PHP error:

&gt;Fatal error: Allowed memory size...

Any clues on how to achieve this?
I&#39;ve done it before in PHP (wihtout MVC), but I don&#39;t know what can be missing to do it through Symfony2...

Maybe the solution is setting the memory_limit in PHP.INI, but I guess it&#180;s not the best practice...

Symfony2 - Force file download

I&#39;m trying to connect to an API, authenticate a user and then view the user details. This is accomplished by first accessing the login endpoint at

    http://api.example.com/login/&lt;username&gt;/&lt;password&gt;

to log in and then the following to view user details:

    http://api.example.com/user/

This all works in a web browser. However, once I try to use Curl, the login works fine, but when attempting to view user details, I get back a 401, unauthorized error. I believe this is because Curl isn&#39;t saving the session cookies properly? Can someone point out why it isn&#39;t working and how to fix it? I&#39;ve tried searching stack exchange, however, none of the solutions I&#39;ve tried have worked for my situation. The code I&#39;m using to curl the endpoints is shown below. Thanks!

    define(&quot;COOKIE_FILE&quot;, &quot;cookie.txt&quot;);
    
    // Login the user
    $ch = curl_init(&#39;http://api.example.com/login/joe/smith&#39;);
    curl_setopt ($ch, CURLOPT_COOKIEJAR, COOKIE_FILE); 
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, true);
    echo curl_exec ($ch);

    // Read the session saved in the cookie file
	echo &quot;&lt;br/&gt;&lt;br/&gt;&quot;;
	$file = fopen(&quot;cookie.txt&quot;, &#39;r&#39;);
	echo fread($file, 100000000);	
    echo &quot;&lt;br/&gt;&lt;br/&gt;&quot;;

    // Get the users details
    $ch = curl_init(&#39;http://api.example.com/user&#39;);
    curl_setopt ($ch, CURLOPT_COOKIEJAR, COOKIE_FILE); 
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, true);
    echo curl_exec ($ch);

This code will output:

    HTTP/1.1 200 OK Date: Mon, 22 Oct 2012 21:23:57 GMT Server: LiteSpeed Connection: close X-Powered-By: PHP/5.3.14 Set-Cookie: cfapi=f481129c9616b8f69cc36afe16466545; path=/ Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Content-Type: application/json X-Powered-By: CFWAPI 0.1a Content-Length: 46 {&quot;status&quot;:200,&quot;msg&quot;:&quot;Successfully Logged In.&quot;}

    # Netscape HTTP Cookie File # http://curl.haxx.se/rfc/cookie_spec.html # This file was generated by libcurl! Edit at your own risk. api.example.com	FALSE	/	FALSE	0	cfapi 94f63b07ccf7e34358c1c922341c020f 

    HTTP/1.1 401 Unauthorized Date: Mon, 22 Oct 2012 21:23:57 GMT Server: LiteSpeed Connection: close X-Powered-By: PHP/5.3.14 Set-Cookie: cfapi=a8eb015a7c423dde95aa01579c4729a4; path=/ Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Content-Type: application/json X-Powered-By: CFWAPI 0.1a Content-Length: 49 {&quot;status&quot;:401, &quot;msg&quot;:&quot;You need to login first!&quot;}

Keeping session alive with Curl and PHP

I&#39;ve a file called `demo.php` where I don&#39;t have any GET variables in the URL, so if I want to hide a button if am on this page I can&#39;t use something like this:

    if($_GET[&#39;name&#39;] == &#39;value&#39;) {
      //Hide
    } else {
      //show
    }

So I want something like

    $filename = //get file name
    if($filename == &#39;file_name.php&#39;) {
      //Hide
    } else {
      //show
    }

I don&#39;t want to declare unnecessary GET variables just for doing this...


How to get current PHP page name

Is there a way of doing something like this:

    $test_array = array(&quot;first_key&quot; =&gt; &quot;first_value&quot;, 
                        &quot;second_key&quot; =&gt; &quot;second_value&quot;);

    var_dump(array_map(function($a, $b) { return &quot;$a loves $b&quot;; }, 
             array_keys($test_array), 
             array_values($test_array)));

But instead of calling `array_keys` and `array_values`, directly passing the `$test_array` variable?

The desired output is:

    array(2) {
      [0]=&gt;
      string(27) &quot;first_key loves first_value&quot;
      [1]=&gt;
      string(29) &quot;second_key loves second_value&quot;
    }

PHP&#39;s array_map including keys

I have a form on one page that submits to another page. There, it checks if the input `mail` is filled. If so then do something and if it is not filled, do something else. I don&#39;t understand why it always says that it is set, even if I send an empty form. What is missing or wrong?

`step2.php`:
  
    &lt;form name=&quot;new user&quot; method=&quot;post&quot; action=&quot;step2_check.php&quot;&gt; 
        &lt;input type=&quot;text&quot; name=&quot;mail&quot;/&gt; &lt;br /&gt;
        &lt;input type=&quot;password&quot; name=&quot;password&quot;/&gt;&lt;br /&gt;
        &lt;input type=&quot;submit&quot;  value=&quot;continue&quot;/&gt;
    &lt;/form&gt;

`step2_check.php`:

    if (isset($_POST[&quot;mail&quot;])) {
    	echo &quot;Yes, mail is set&quot;;	
    } else {	
    	echo &quot;N0, mail is not set&quot;;
    }

If isset $_POST

How can I limit the length of the text, e.g., 50, and put three dots in the display?



    {% if myentity.text|length &gt; 50 %}
    
    {% block td_text %} {{ myentity.text}}{% endblock %}
    
    {%endif%}

symfony 2 twig limit the length of the text and put three dots

Is there a shorter syntax in Twig to output a conditional string of text?

    &lt;h1&gt;{% if not info.id %}create{% else %}edit{% endif %}&lt;/h1&gt;

Traditional php is even easier than this:

    &lt;h1&gt;&lt;?php info[&#39;id&#39;]? &#39;create&#39; : &#39;edit&#39; ?&gt;&lt;/h1&gt;

Is there a Twig shorthand syntax for outputting conditional text

In PHP we can check if a key exists in an array by using the function `array_key_exists()`.

In the Twig templating language we can check if an variable or an object&#39;s property exists simply by using an `if` statement, like this:

    {% if app.user %}
    do something here
    {% else %}
    do something else
    {% endif %}

But how do we check if a key of an *array* exists using Twig? I tried `{% if array.key %}`, but it gives me an error:

    Key &quot;key&quot; for array with keys &quot;0, 1, 2, 3...648&quot; does not exist

As one of the primary ways of passing data into a template is using arrays, it seems like there should be some way of doing this. Any thoughts?

In Twig, check if a specific key of an array exists

As you know, both angular and twig has common control construction - double curly braces. How can I change default value of Angular?

I know that I can do it in Twig, but in some projects I can&#39;t, only JS.

AngularJS-Twig conflict with double curly braces

Is it possible to check if given variable is string in `Twig` ?

Expected solution:


`messages.en.yml`:

    hello:
      stranger: Hello stranger !
      known: Hello %name% !


`Twig` template:


    {% set title=&#39;hello.stranger&#39; %}
    {% set title=[&#39;hello.known&#39;,{&#39;%name%&#39; : &#39;hsz&#39;}] %}
    
    {% if title is string %}
      {{ title|trans }}
    {% else %}
      {{ title[0]|trans(title[1]) }}
    {% endif %}

Is it possible to do it this way ? Or maybe you have better solution ?

Check if variable is string or array in Twig

I have a string:

    /abc/def/ghfj.doc

I would like to extract `ghfj.doc` from this, i.e. the substring after the last `/`, or first `/` from right.

Could someone please provide some help?


Java: Getting a substring from a string starting after a particular character

    mylist = [&quot;aa123&quot;, &quot;bb2322&quot;, &quot;aa354&quot;, &quot;cc332&quot;, &quot;ab334&quot;, &quot;333aa&quot;]

I need the index position of all items that contain `&#39;aa&#39;`. I&#39;m having trouble combining `enumerate()` with partial string matching. I&#39;m not even sure if I should be using enumerate. 

I just need to return the index positions: 0,2,5





Find all index position in list based on partial string inside item in list

I am trying to extract a string from within a larger string where it get everything inbetween a `:` and a `;`

Current

    Str = &#39;MyLongString:StringIWant;&#39;

Desired Output

    newStr = &#39;StringIWant&#39;

Get Substring between two characters using javascript

How to split the name string in mysql ?
  
E.g.:  

    name
    -----
    Sachin ramesh tendulkar
    Rahul dravid

Split the name like `firstname,middlename,lastname`:

    firstname   middlename    lastname
    ---------  ------------   ------------
    sachin     ramesh         tendulkar
    rahul      dravid


How to split the name string in mysql?

i&#39;m having a string in c# for which i have to find a specific word &quot;code&quot; in the string and have to get the remaining string after the word &quot;code&quot;.

The string is 


&gt; &quot;Error description, **code** : -1&quot;

so i have to find the word **code** in the above string and i have to get the error code.
I have seen regex but now clearly understood. Is there any simple way ?

Need to get a string after a &quot;word&quot; in a string in c#

Why does the following statement return false in JavaScript?

    new String(&#39;hello&#39;) === new String(&#39;hello&#39;)

Why does new String(&#39;hello&#39;) === new String(&#39;hello&#39;) evaluate to False?

Does the C++ specification define:

 1. the existence of the &#39;less than&#39; operator for boolean parameters, and if so,
 2. the result of the 4 parameter permutations?

In other words, are the results from the following operations defined by the specification?

    false &lt; false
    false &lt; true
    true &lt; false
    true &lt; true

On my setup (Centos 7, gcc 4.8.2) , the code below spits out what I&#39;d expect (given C&#39;s history of representing false as 0 and true as 1):

    false &lt; false = false
    false &lt; true = true
    true &lt; false = false
    true &lt; true = false

Whilst I&#39;m pretty sure most (all?) compilers will give the same output, is this legislated by the C++ specification? Or is an obfuscating, but specification-compliant compiler allowed to decide that true is less than false?

    #include &lt;iostream&gt;

    const char * s(bool a)
    {
      return (a ? &quot;true&quot; : &quot;false&quot;);
    }

    void test(bool a, bool b)
    {
      std::cout &lt;&lt; s(a) &lt;&lt; &quot; &lt; &quot; &lt;&lt; s(b) &lt;&lt; &quot; = &quot; &lt;&lt; s(a &lt; b) &lt;&lt; std::endl;
    }

    int main(int argc, char* argv[])
    {
      test(false, false);
      test(false, true);
      test(true, false);
      test(true, true);
      return 0;
    }

Is the operation &quot;false &lt; true&quot; well defined?

If I do this:

    &gt;&gt;&gt; False in [False, True]
    True

That returns `True`. Simply because `False` is in the list.

But if I do:

    &gt;&gt;&gt; not(True) in [False, True]
    False

That returns `False`. Whereas `not(True)` is equal to `False`:

    &gt;&gt;&gt; not(True)
    False

Why?


Why does &quot;not(True) in [False, True]&quot; return False?

There&#39;s a new comparison operator `&lt;=&gt;` in C++20. However I think in most cases a simple subtraction works well:

    int my_strcmp(const char *a, const char *b) {
        while (*a == *b &amp;&amp; *a != 0 &amp;&amp; *b != 0) {
            a++, b++;
        }
        // Version 1
        return *a - *b;
        // Version 2
        return *a &lt;=&gt; *b;
        // Version 3
        return ((*a &gt; *b) - (*a &lt; *b));
    }

They have the same effect. I can&#39;t really understand the difference.

How is the three-way comparison operator different from subtraction?

While checking the references for another question, I noticed an odd clause in C++11, at [expr.rel] &#182;3:

&gt; Pointers to `void` (after pointer conversions) can be compared, with a result defined as follows: If both
pointers represent the same address or are both the null pointer value, the result is `true` if the operator is
`&lt;=` or `&gt;=` and `false` otherwise; otherwise the result is unspecified.

This seems to mean that, once two pointers have been casted to `void *`, their ordering relation is no longer guaranteed; for example, this:

    int foo[] = {1, 2, 3, 4, 5};
    void *a = &amp;foo[0];
    void *b = &amp;foo[1];
    std::cout&lt;&lt;(a &lt; b);

would seem to be unspecified.

Interestingly, this clause wasn&#39;t there in C++03 and disappeared in C++14, so if we take the example above and apply the C++14 wording to it, I&#39;d say that &#182;3.1

&gt; - If two pointers point to different elements of the same array, or to subobjects thereof, the pointer to the element with the higher subscript compares greater.

would apply, as `a` and `b` point to elements of the same array, even though they have been casted to `void *`. Notice that the wording of &#182;3.1 was there pretty much the same in C++11, but seemed to be overridden by the `void *` clause.

Am I right in my understanding? What was the point of that oddball clause added in C++11 and immediately removed? Or maybe it&#39;s still there, but moved to/implied by some other part of the standard?

Content Type	Original Author	Original Content on Stackoverflow
Question	user1440167	View Question on Stackoverflow
Solution 1 - Php	HamZa	View Answer on Stackoverflow

Find substring in the string in TWIG

Php Problem Overview

Php Solutions

Solution 1 - Php

How do you do a simple "chmod +x" from within python?

initialize a vector to zeros C++/C++11

Attributions