Expose Vips library version to PHP

[chregu]

It would be useful to know which vips library version is used, so that the user can be warned, in case it's not the correct one with features missing. I see that there's the vips_version() function in vips, but I couldn't figure out, how to access that from PHP.

Something like

PHP_FUNCTION(vips_version) {
  char digits[256];
  vips_snprintf(digits, 256, "%d.%d.%d", vips_version(0), vips_version(1), vips_version(2));
  RETVAL_STRING(strdup(digits))
}

would maybe do it already (my PHP C know how is too rusty, but I can give it a try, if it's not already accessible through other means)

[jcupitt]

Hello again, this is in the info table, would that be enough?

$ php -i
vips

vips property => value
Major version => 8
Minor version => 6
Micro version => 0
SIMD support with liborc => yes
JPEG support => yes
PNG support => yes
TIFF support => yes
GIF support => yes
OpenEXR support => yes
load OpenSlide => yes
load Matlab => yes
load PDF => yes
load SVG => yes
FITS support => yes
WebP support => yes
load with libMagick => yes
Text rendering support => yes
ICC profile support with lcms => yes

Otherwise, you're right, we'd need to add another API call to vips.c.

[chregu]

Unfortunately phpinfo() is not enough, I use for example composite in my publicly available class (it's now here https://github.com/rokka-io/imagine-vips ) and i'd like to throw an informative exception, if the vips version isn't 8.6 yet. Or maybe in other cases fall back to an older way to do things (eg rotate with affinity we discussed). So a vips_version function would be great to have.

[chregu]

made an MR in #15. Hopefully I did it right

[jcupitt]

OK, all done, I'll close.