你的脚本占用了太多内存。在PHP中，如果有一个超出控制的循环，并且每次循环都要创建对象或向数组中添加内容，则经常会发生这种情况。

检查有无无限循环。

如果这不是问题，尝试通过将对象设置为null来销毁它们来帮助PHP。如。$OldVar = null;

还要检查实际发生错误的代码。你认为这一行会分配大量的内存吗?如果没有，试着找出哪里出了问题。

I was also having the same problem, looked for phpinfo.ini, php.ini or .htaccess files to no avail. Finally I have looked at some php files, opened them and checked the codes inside for memory. Finally this solution was what I come out with and it worked for me. I was using wordpress, so this solution might only work for wordpress memory size limit problem. My solution, open default-constants.php file in /public_html/wp-includes folder. Open that file with code editor, and find memory settings under wp_initial_constants scope, or just Ctrl+F it to find the word "memory". There you will come over WP_MEMORY_LIMIT and WP_MAX_MEMORY_LIMIT. Just increase it, it was 64 MB in my case, I increased it to 128 MB and then to 200 MB.

// Define memory limits.
if ( ! defined( 'WP_MEMORY_LIMIT' ) ) {
    if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {
        define( 'WP_MEMORY_LIMIT', $current_limit );
    } elseif ( is_multisite() ) {
        define( 'WP_MEMORY_LIMIT', '200M' );
    } else {
        define( 'WP_MEMORY_LIMIT', '128M' );
    }
}

if ( ! defined( 'WP_MAX_MEMORY_LIMIT' ) ) {
    if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {
        define( 'WP_MAX_MEMORY_LIMIT', $current_limit );
    } elseif ( -1 === $current_limit_int || $current_limit_int > 268435456 /* = 256M */ ) {
        define( 'WP_MAX_MEMORY_LIMIT', $current_limit );
    } else {
        define( 'WP_MAX_MEMORY_LIMIT', '256M' );
    }
}

顺便说一句，请不要做下面的代码，因为这是不好的做法:

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

COMPOSER_MEMORY_LIMIT=-1 composer require mageplaza/module-core

It is unfortunately easy to program in PHP in a way that consumes memory faster than you realise. Copying strings, arrays and objects instead of using references will do it, though PHP 5 is supposed to do this more automatically than in PHP 4. But dealing with your data set in entirety over several steps is also wasteful compared to processing the smallest logical unit at a time. The classic example is working with large resultsets from a database: most programmers fetch the entire resultset into an array and then loop over it one or more times with foreach(). It is much more memory efficient to use a while() loop to fetch and process one row at a time. The same thing applies to processing a file.

我在php7.2和laravel 5.6中遇到了同样的问题。我只是增加变量memory_limit = 128M在php.ini的数量作为我的应用程序的需求。可能是256M/512M/1048M.....现在它工作得很好。

如果使用共享主机，则不能强制增加php大小限制。

只要去你的cpanel和升级你的php版本到7.1以上，然后你就可以去了。