Fix TypeError: count() in PHP8

[NiklasBr]

Resolves #555

[mazuk6]

I think it will close this one as well.. https://github.com/tecnickcom/TCPDF/issues/526

[williamdes]

Can you add one example in the examples folder with the code that created this error? This will help cover your fix

[codecov-commenter]

Codecov Report

Merging #556 (bf2e8b5) into main (6da8a0f) will increase coverage by 0.12%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #556      +/-   ##
==========================================
+ Coverage   72.86%   72.99%   +0.12%     
==========================================
  Files         127      127              
  Lines       21666    21673       +7     
==========================================
+ Hits        15787    15820      +33     
+ Misses       5879     5853      -26     

Flag	Coverage Δ
php-7.1-ubuntu-latest	72.92% <100.00%> (?)
php-7.3-ubuntu-latest	?
php-7.4-ubuntu-latest	?
php-8.1-ubuntu-latest	?
php-nightly-ubuntu-latest	72.80% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tcpdf.php	71.65% <100.00%> (+0.16%)	:arrow_up:
tcpdf_barcodes_1d.php	87.37% <0.00%> (ø)
examples/example_003.php	100.00% <0.00%> (ø)
examples/example_010.php	100.00% <0.00%> (ø)
examples/example_011.php	100.00% <0.00%> (ø)
examples/example_051.php	100.00% <0.00%> (ø)
examples/example_059.php	100.00% <0.00%> (ø)
examples/example_020.php	96.00% <0.00%> (+0.08%)	:arrow_up:
include/tcpdf_static.php	52.97% <0.00%> (+0.20%)	:arrow_up:
... and 1 more

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[nicolaasuni]

In order to be able to merge this the license/cla must be signed.

[NiklasBr]

I can't see the CLA link which usually accompanies those PR:s.