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Example code of mrsuh/php-var-sizeof

Informations about the package php-var-sizeof

PHP var_sizeof()

Tests

Function for getting size of any PHP variable in bytes.
It must be more accurate tool to calculate total size of PHP variable than memory_get_usage(), but it has restrictions.

How it works

var_sizeof() with var_class_sizeof() uses FFI to access internal structures of PHP variables.
It calculates the size of internal structures such as zval, _zend_array, _zend_object, etc., as well as additional allocated memory for them.
It doesn't take into calculate the memory of handlers/functions/etc.

Requirements

How to install

Functions

Usage

var_sizeof vs memory_get_usage

PHP 8.1.2 Linux(x86_64)

type var_sizeof(bytes) memory_get_usage(bytes)
NULL 16 0
boolean(true) 16 0
integer(1) 16 0
double(1.5) 16 0
string("hello world") 27 40
resource 48 416
callable 72 384
array(count: 0, list: true) 336 0
array(count: 100, list: true) 2,128 8,248
array(count: 1,000, list: true) 16,464 36,920
array(count: 10,000, list: true) 262,224 528,440
array(count: 100, list: false) 5,192 8,248
array(count: 1,000, list: false) 41,032 41,016
array(count: 10,000, list: false) 655,432 655,416
EmptyClass{} 72 40
ClassWithArray{"array(count: 0, list: true)"} 408 56
ClassWithArray{"array(count: 100, list: true)"} 2,200 8,304
ClassWithArray{"array(count: 1,000, list: true)"} 16,536 36,976
ClassWithArray{"array(count: 10,000, list: true)"} 262,296 528,496
ClassWithObject{"EmptyClass{}"} 144 96
ArrayIterator{"array(count: 100, list: true)"} 2,264 8,376
ArrayIterator{"array(count: 100, list: false)"} 5,328 40,376
type var_class_sizeof(bytes) var_sizeof(bytes) memory_get_usage(bytes)
EmptyClass{} 1,362 72 40
ClassWithArray{"array(count: 0, list: true)"} 1,494 408 56
ClassWithArray{"array(count: 100, list: true)"} 1,494 2,200 8,304
ClassWithArray{"array(count: 1,000, list: true)"} 1,494 16,536 36,976
ClassWithArray{"array(count: 10,000, list: true)"} 1,494 262,296 528,496
ClassWithObject{"EmptyClass{}"} 1,495 144 96
ArrayIterator{"array(count: 100, list: true)"} 2,437 2,264 8,376
ArrayIterator{"array(count: 100, list: false)"} 2,437 5,328 40,376

:warning: Restrictions

For contributors

How to reproduce a table of numbers above

How to compile library

All versions of php-var-sizeof with dependencies

PHP Build Version
Package Version
Requires php Version >=7.4
ext-ffi Version *
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