arrays - PHP count elements in formatted string -


this has been boggling mind day need help. in given string such follwing:

$str = 'a:1:{s:8:"post_tag";a:5:{ i:460;a:5:{s:11:"wpseo_title";s:8:"demodemo";s:10:"wpseo_desc";s:8:"demodemo";s:13:"wpseo_bctitle";s:8:"demodemo";s:13:"wpseo_noindex";s:7:"default";s:21:"wpseo_sitemap_include";s:1:"-";} i:459;a:5:{s:11:"wpseo_title";s:8:"testtest";s:10:"wpseo_desc";s:8:"testtest";s:13:"wpseo_bctitle";s:8:"testtest";s:13:"wpseo_noindex";s:7:"default";s:21:"wpseo_sitemap_include";s:1:"-";} i:462;a:5:{s:11:"wpseo_title";s:7:"bikey77";s:10:"wpseo_desc";s:7:"bikey77";s:13:"wpseo_bctitle";s:7:"bikey77";s:13:"wpseo_noindex";s:7:"default";s:21:"wpseo_sitemap_include";s:1:"-";} i:463;a:5:{s:11:"wpseo_title";s:7:"dimitra";s:10:"wpseo_desc";s:7:"dimitra";s:13:"wpseo_bctitle";s:7:"dimitra";s:13:"wpseo_noindex";s:7:"default";s:21:"wpseo_sitemap_include";s:1:"-";} i:464;a:5:{s:11:"wpseo_title";s:8:"dimitra1";s:10:"wpseo_desc";s:8:"dimitra1";s:13:"wpseo_bctitle";s:8:"dimitra1";s:13:"wpseo_noindex";s:7:"default";s:21:"wpseo_sitemap_include";s:1:"-";} }}';

how count number of substrings begin i:xxx... , end ...;} ??

substring example:

i:460;a:5:s:11:"wpseo_title";s:8:"demodemo";s:10:"wpseo_desc";s:8:"demodemo";s:13:"wpseo_bctitle";s:8:"demodemo";s:13:"wpseo_noindex";s:7:"default";s:21:"wpseo_sitemap_include";s:1:"-";}

looks you're dealing serialized array, so...

$data = unserialize($str); echo count($data['post_tag']);

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