PHP

Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 119541600 bytes) in C:xampphtdocsackup-vice.php on line 67

<?php 
ini_set('memory_limit', '1024M'); // or you could use 1G

?>

Allowed memory size of 1610612736 bytes exhausted

export COMPOSER_MEMORY_LIMIT=-1

Allowed memory size of 134217728 bytes exhausted (tried to allocate 20480 bytes)

ini_set('memory_limit', '1024M');  // 1GB
// OR
ini_set('memory_limit', '-1');    // unlimited memory (may cause a memory leak)

Allowed memory size of 33554432 bytes exhausted (tried to allocate 43148176 bytes) in php

ini_set('memory_limit', '-1');

Allowed memory size of 134217728 bytes exhausted (tried to allocate 65015808 bytes)

//Allowed memory size of 134217728 bytes exhausted (tried to allocate 65015808 bytes)
<?php 
ini_set('memory_limit', '1024M');
?>
Or
set in php.ini
memory_limit = -1

PHP Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes)

php -d memory_limit=-1 /usr/local/bin/composer install

PHP Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes)

set COMPOSER_MEMORY_LIMIT=-1

Fatal error: Allowed memory size of 1610612736 bytes exhausted

Fatal error: Allowed memory size of 1610612736 bytes exhausted

export COMPOSER_MEMORY_LIMIT=-1
and restart composer update

Fatal error: Allowed memory size of 1610612736 bytes exhausted but already allocated 1.75G

In my case with Xampp with Windows 10

i just changed:

;memory_limit=512M 
by commenting this configuration, in php.ini to:

memory_limit =-1

Allowed memory size of 1610612736 bytes exhausted 4096

php -d memory_limit=-1 composer.phar require hwi/oauth-bundle php-http/guzzle6-adapter php-http/httplug-bundle

PHP Fatal error: Allowed memory size of 134217728 bytes exhausted

memory_limit = 64M;

Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes) laravel

1. Firstly i find which php.ini is working because i was using multiple xampp,
  so using : php --ini
2. after that in that file i updated the memory_limit = -1    

PHP Fatal error: Allowed memory size of 1610612736 bytes exhausted

php --ini

nano /etc/php5/cli/php.ini (it could be different for you)

Search for memory_limit by (ctrl + w)
  
make memory_limit to -1 or 2G (depending on what you can increase to)
  
save by (ctrl + x) then enter

Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 32 bytes) in

;memory_limit=512M 

allowed memory size of 33554432 bytes exhausted (tried to allocate 8192 bytes)

ini_set('memory_limit', '44M');

magento Fatal error: Allowed memory size of 134217728 bytes exhausted

A quick solution for memory limit in Magento 2 command is directly adding memory limit inside command.

For Compilation command,

php -dmemory_limit=5G bin/magento setup:di:compile
For Deployment

php -dmemory_limit=5G bin/magento setup:static-content:deploy