Description:
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It seems there was another BC break in unserialize().

Reproduce code:
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my pear.ini file:
#PEAR_Config 0.9
a:7:{s:15:"preferred_state";s:6:"stable beta";s:7:"bin_dir";s:11:"C:\php\PEAR";s:7:"php_dir";s:16:"C:\php\PEAR\pear";s:7:"doc_dir";s:21:"C:\php\PEAR\pear\docs";
s:8:"data_dir";s:21:"C:\php\PEAR\pear\data";s:8:"test_dir";s:22:"C:\php\PEAR\pear\tests";s:7:"php_bin";s:14:"C:\PHP\php.exe";}


php -r "print_r(unserialize(file_get_contents('pear.ini')));"

Actual result:
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Notice: unserialize() Error at offset 0 of 303 bytes in Command line code on line 1