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Informations about the package memory-info
PHP Memory Info
PHP Memory Info is a small PHP library for reading the current memory status on Linux systems.
It reads /proc/meminfo, normalizes the kernel field names, and returns a typed MemoryInfo object. Values are
integers in bytes when the Linux kernel exposes the field; optional fields are null when absent.
Requirements
- Linux with a readable
/proc/meminfo - PHP 8.2 or newer
- Composer
Installation
Quick Start
MemoryInfo exposes public readonly properties for the supported /proc/meminfo fields, for example memTotal,
memAvailable, swapTotal, and committedAS.
If you already have /proc/meminfo contents, parse them directly:
Properties
The descriptions below are short summaries of the Linux /proc/meminfo fields. Kernel details can vary between Linux
versions. Optional properties are null when the current kernel does not expose the matching field.
| Property | /proc/meminfo key |
Availability | Description |
|---|---|---|---|
memTotal |
MemTotal |
Required | Total usable physical RAM. |
memFree |
MemFree |
Required | Physical RAM that is currently unused. |
memAvailable |
MemAvailable |
Optional | Estimate of memory available for new applications without swapping. |
buffers |
Buffers |
Required | Memory used for temporary block device buffers. |
cached |
Cached |
Required | Memory used for the page cache, excluding swap cache. |
swapCached |
SwapCached |
Optional | Swap-backed memory that is also still cached in RAM. |
active |
Active |
Optional | Recently used memory that is less likely to be reclaimed. |
inactive |
Inactive |
Optional | Less recently used memory that is more likely to be reclaimed. |
activeAnon |
Active(anon) |
Optional | Active anonymous memory, not backed by files. |
inactiveAnon |
Inactive(anon) |
Optional | Inactive anonymous memory, not backed by files. |
activeFile |
Active(file) |
Optional | Active file-backed memory. |
inactiveFile |
Inactive(file) |
Optional | Inactive file-backed memory. |
unevictable |
Unevictable |
Optional | Memory that cannot be reclaimed by the kernel. |
mlocked |
Mlocked |
Optional | Memory locked into RAM with mlock. |
swapTotal |
SwapTotal |
Required | Total configured swap space. |
swapFree |
SwapFree |
Required | Swap space that is currently unused. |
dirty |
Dirty |
Optional | Memory waiting to be written back to disk. |
writeback |
Writeback |
Optional | Memory currently being written back to disk. |
anonPages |
AnonPages |
Optional | Non-file-backed pages mapped into user space. |
mapped |
Mapped |
Optional | Files mapped into memory by processes. |
shmem |
Shmem |
Optional | Shared memory, including tmpfs memory. |
kReclaimable |
KReclaimable |
Optional | Kernel allocations that the kernel can reclaim. |
slab |
Slab |
Optional | Kernel memory used for internal data structure caches. |
sReclaimable |
SReclaimable |
Optional | Reclaimable part of slab memory. |
sUnreclaim |
SUnreclaim |
Optional | Non-reclaimable part of slab memory. |
kernelStack |
KernelStack |
Optional | Memory used for kernel stacks. |
pageTables |
PageTables |
Optional | Memory used for page tables. |
nfsUnstable |
NFS_Unstable |
Optional | NFS pages sent to the server but not yet committed. |
bounce |
Bounce |
Optional | Memory used for block device bounce buffers. |
writebackTmp |
WritebackTmp |
Optional | Temporary memory used for FUSE writeback buffers. |
commitLimit |
CommitLimit |
Optional | Total memory that can be committed under the current overcommit policy. |
committedAS |
Committed_AS |
Optional | Total memory currently committed to processes. |
vmallocTotal |
VmallocTotal |
Optional | Total virtual address space available for vmalloc. |
vmallocUsed |
VmallocUsed |
Optional | Virtual address space currently used by vmalloc. |
vmallocChunk |
VmallocChunk |
Optional | Largest contiguous vmalloc area, often reported as 0 on newer kernels. |
Behavior
- Values from
/proc/meminfoare converted fromkBto bytes. - Additional kernel fields are accepted by the parser but ignored by
MemoryInfo. - Missing required fields raise
MemoryInfoReadException. - Missing optional fields are exposed as
null. - Invalid non-empty lines or values without numbers raise
InvalidArgumentExceptionfrom the parser. - For tests or fixtures, pass a custom file path as the second
MemoryDataReaderconstructor argument.
Development
Install dependencies:
Run the full check suite:
Run checks individually:
Apply Rector changes explicitly:
Continuous integration runs composer validate --strict and composer check on PHP 8.2, 8.3, 8.4, and 8.5.
If PHP is not installed locally, use the official PHP Docker image:
The repository keeps composer.lock committed so development tooling is reproducible.
License
MIT
