Php How Execute Artisan Key Generate
It is because in Laravel 4 By using 'php artisan key:generate' we simply can replace the default key any time. But if it is an empty space it can not be able to hold the place. The key generator will only update the APPKEY in the.env file. Config/app.php this is reading the APPKEY from your.env file. I can't run php artisan key:generate and php artisan php artisan ErrorException. I can't run php artisan key:generate and php artisan. This topic has been deleted. Only users with topic management privileges can see it. Last edited by 303 points.
This is an article which is specifically written to generate key used in a Laravel web-based application project. The key generated is very special for several features which is needed by the Laravel web-based application itself. It is important because the key is going to be used further for generating cookies and even password across the application. It is actually generated a 32-length of random string. Dllkit pro license key generator.
Actually, it is going to be automatically generated upon the creation of the Laravel web-based application using composer utility or command which is represented with ‘composer create-project laravel/laravel’ command.
The key generated by typing a command which is executed as follows :
So, the command itself will sets the APP_KEY value in your .env file. On the other hand, if the Laravel web-based project is created by using a version control system like git to manage it for further usage, for an example calling git push to be able to push the source to a certain repository, it will definitely push a copy of the Laravel project to wherever it is going, but will not include the existing .env file . So, in order to run the project after cloning the project using git clone, it must be manually execute ‘php artisan key:generate’ for the application itself to function correctly.
But the command will failed as shown below :
Php Execute Shell
This is a command which is needed to be carried out by a specific user account. It is might be the permission which is needed to write the .env file doesn’t fit enough. Only specific file is allowed to write or to modified the .env file since executing the command will actually insert a certain key value generated by the command to a specific file named ‘.env’. Try to re-execute the command and in the following output, it is executed using ‘root’ account as shown below :
The generated key can actually be viewed in the file .env as shown below for an example :
To generate the key, make sure that the entry in config/app.php which is defining the cipher used and the location of the exact 32 characters string will be inserted.
Generator syntax
A generator function looks just like a normal function, except that instead of returning a value, a generator yields as many values as it needs to. Any function containing yield is a generator function.
When a generator function is called, it returns an object that can be iterated over. When you iterate over that object (for instance, via a foreach loop), PHP will call the object's iteration methods each time it needs a value, then saves the state of the generator when the generator yields a value so that it can be resumed when the next value is required.
Once there are no more values to be yielded, then the generator can simply exit, and the calling code continues just as if an array has run out of values.
Note:
In PHP 5, a generator could not return a value: doing so would result in a compile error. An empty return statement was valid syntax within a generator and it would terminate the generator. Since PHP 7.0, a generator can return values, which can be retrieved using Generator::getReturn().
yield keyword
The heart of a generator function is the yield keyword. In its simplest form, a yield statement looks much like a return statement, except that instead of stopping execution of the function and returning, yield instead provides a value to the code looping over the generator and pauses execution of the generator function.
Example #1 A simple example of yielding values
<?php
function gen_one_to_three() {
for ($i = 1; $i <= 3; $i++) {
// Note that $i is preserved between yields.
yield $i;
}
}
$generator = gen_one_to_three();
foreach ($generator as $value) {
echo '$valuen';
}
?>Note:
Internally, sequential integer keys will be paired with the yielded values, just as with a non-associative array.
CautionPhp Execute Online
If you use yield in an expression context (for example, on the right hand side of an assignment), you must surround the yield statement with parentheses in PHP 5. For example, this is valid:
But this is not, and will result in a parse error in PHP 5:
The parenthetical restrictions do not apply in PHP 7.
The value that will be assigned to $data is the value passed to Generator::send(), or NULL if Generator::next() is called instead.
Yielding values with keys
PHP also supports associative arrays, and generators are no different. In addition to yielding simple values, as shown above, you can also yield a key at the same time.
The syntax for yielding a key/value pair is very similar to that used to define an associative array, as shown below.
Example #2 Yielding a key/value pair
<?php
/*
* The input is semi-colon separated fields, with the first
* field being an ID to use as a key.
*/
$input = <<<'EOF'
1;PHP;Likes dollar signs
2;Python;Likes whitespace
3;Ruby;Likes blocks
EOF;
function input_parser($input) {
foreach (explode('n', $input) as $line) {
$fields = explode(';', $line);
$id = array_shift($fields);
yield $id => $fields;
}
}
foreach (input_parser($input) as $id => $fields) {
echo '$id:n';
echo ' $fields[0]n';
echo ' $fields[1]n';
}
?>As with the simple value yields shown earlier, yielding a key/value pair in an expression context requires the yield statement to be parenthesised:
Yielding null values
Yield can be called without an argument to yield a NULL value with an automatic key.
Example #3 Yielding NULLs
<?php
function gen_three_nulls() {
foreach (range(1, 3) as $i) {
yield;
}
}
var_dump(iterator_to_array(gen_three_nulls()));
?>Yielding by reference
Generator functions are able to yield values by reference as well as by value. This is done in the same way as returning references from functions: by prepending an ampersand to the function name.
Example #4 Yielding values by reference
<?php
function &gen_reference() {
$value = 3;
while ($value > 0) {
yield $value;
}
}
/*
* Note that we can change $number within the loop, and
* because the generator is yielding references, $value
* within gen_reference() changes.
*/
foreach (gen_reference() as &$number) {
echo (--$number).'.. ';
}
?>Generator delegation via yield from
In PHP 7, generator delegation allows you to yield values from another generator, Traversable object, or array by using the yield from keyword. The outer generator will then yield all values from the inner generator, object, or array until that is no longer valid, after which execution will continue in the outer generator.
Execute Php File
If a generator is used with yield from, the yield from expression will also return any value returned by the inner generator.
Cautionyield from does not reset the keys. It preserves the keys returned by the Traversable object, or array. Thus some values may share a common key with another yield or yield from, which, upon insertion into an array, will overwrite former values with that key.
A common case where this matters is iterator_to_array() returning a keyed array by default, leading to possibly unexpected results. iterator_to_array() has a second parameter use_keys which can be set to FALSE to collect all the values while ignoring the keys returned by the Generator.
Example #5 yield from with iterator_to_array()
<?php
function inner() {
yield 1; // key 0
yield 2; // key 1
yield 3; // key 2
}
function gen() {
yield 0; // key 0
yield from inner(); // keys 0-2
yield 4; // key 1
}
// pass false as second parameter to get an array [0, 1, 2, 3, 4]
var_dump(iterator_to_array(gen()));
?>Example #6 Basic use of yield from
<?php
function count_to_ten() {
yield 1;
yield 2;
yield from [3, 4];
yield from new ArrayIterator([5, 6]);
yield from seven_eight();
yield 9;
yield 10;
}
function seven_eight() {
yield 7;
yield from eight();
}
function eight() {
yield 8;
}
foreach (count_to_ten() as $num) {
echo '$num ';
}
?>Example #7 yield from and return values
Php How Execute Artisan Key Generate Key
<?php
function count_to_ten() {
yield 1;
yield 2;
yield from [3, 4];
yield from new ArrayIterator([5, 6]);
yield from seven_eight();
return yield from nine_ten();
}
function seven_eight() {
yield 7;
yield from eight();
}
function eight() {
yield 8;
}
function nine_ten() {
yield 9;
return 10;
}
$gen = count_to_ten();
foreach ($gen as $num) {
echo '$num ';
}
echo $gen->getReturn();
?>