checking memory limit in PHP

Question

I m need to check if memory limit is at least 64M in my script installer  This is just part of PHP code that should work  but probably due to this  M  it s not reading properly the value  How to fix this        memory limit     echo   lt phpmem gt        if key exists  PHP Core    phpinfo                 if key exists  memory limit    phpinfo  PHP Core                            t explode       phpinfo  PHP Core    memory limit                 if  t 0  gt  64                   ok 1              else                  ok 0              echo   lt val gt   phpinfo  PHP Core    memory limit    lt  val gt  lt ok gt  ok lt  ok gt                      else            echo   lt val gt  lt  val gt  lt ok gt 0 lt  ok gt              else         echo   lt val gt  lt  val gt  lt ok gt 0 lt  ok gt        echo   lt  phpmem gt  n

User · Accepted Answer

Try to convert the value first  eg  64M -  64   1024   1024   After that  do comparison and print the result    lt  php  memory limit   ini get  memory limit    if  preg match      d           memory limit   matches         if   matches 2      M              memory limit    matches 1    1024   1024     nnnM - gt  nnn MB       else if   matches 2      K              memory limit    matches 1    1024     nnnK - gt  nnn KB           ok     memory limit  gt   64   1024   1024      at least 64M   echo   lt phpmem gt    echo   lt val gt      memory limit     lt  val gt    echo   lt ok gt       ok   1   0      lt  ok gt    echo   lt  phpmem gt      Please note that the above code is just an idea  Don t forget to handle -1  no memory limit   integer-only value  value in bytes   G  value in gigabytes   k m g  value in kilobytes  megabytes  gigabytes because shorthand is case-insensitive   etc

User · Answer

very old post  but i ll just leave this here      converts a number with byte unit  B   K   M   G  into an integer    function unitToInt  s        return  int preg replace callback     -  d          function   m            return  m 1    pow 1024  strpos  BKMG    m 2            strtoupper  s        mem limit   unitToInt ini get  memory limit

User · Answer

Checking on command line   php -i   grep  memory limit

User · Answer

Command line to check ini     php -r  echo ini get  memory limit

User · Answer

Here is another simpler way to check that    memory limit   return bytes ini get  memory limit     if   memory limit  lt   64   1024   1024            Memory insufficient                Converts shorthand memory notation value to bytes   From http   php net manual en function ini-get php      param  val Memory size shorthand notation string    function return bytes  val         val   trim  val        last   strtolower  val strlen  val -1         val   substr  val  0  -1       switch  last               The  G  modifier is available since PHP 5 1 0         case  g                val    1024          case  m                val    1024          case  k                val    1024            return  val

User · Answer

Thank you for inspiration   I had the same problem and instead of just copy-pasting some function from the Internet  I wrote an open source tool for it  Feel free to use it or provide feedback   https   github com BrandEmbassy php-memory  Just install it using Composer and then you get the current PHP memory limit like this    configuration   new  BrandEmbassy Memory MemoryConfiguration     limitProvider   new  BrandEmbassy Memory MemoryLimitProvider  configuration    limitInBytes    memoryLimitProvider- gt getLimitInBytes

User · Answer

As long as your array  phpinfo  PHP Core    memory limit   contains the value of memory limit  it does work the following    The last character of that value can signal the shorthand notation  If it s an invalid one  it s ignored  The beginning of the string is converted to a number in PHP s own specific way  Whitespace ignored etc  The text between the number and the shorthand notation  if any  is ignored    Example     Memory Limit equal or higher than 64M   ok    int   bool  setting to bytes  phpinfo  PHP Core    memory limit     gt   0x4000000           param string  setting        return NULL number     function setting to bytes  setting        static  short   array  k    gt  0x400                             m    gt  0x100000                             g    gt  0x40000000         setting    string  setting      if     len   strlen  setting    return NULL       last      strtolower  setting  len - 1         numeric    int   setting       numeric    isset  short  last      short  last    1      return  numeric      Details of the shorthand notation are outline in a PHP manual s FAQ entry and extreme details are part of Protocol of some PHP Memory Stretching Fun   Take care if the setting is -1 PHP won t limit here  but the system does  So you need to decide how the installer treats that value

User · Answer

Not so exact but simpler solution    limit   str replace array  G    M    K    array  000000000    000000    000    ini get  memory limit     if  limit  lt  500000000  ini set  memory limit    500M

User · Answer

If you are interested in CLI memory limit   cat  etc php  7 0  cli php ini   grep  memory limit    FPM    Normal   cat  etc php  7 0  fpm php ini   grep  memory limit

[php] checking memory_limit in PHP

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