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<?php $string = "[vc_tab [vc_tab [vc_tab [vc_tab [vc_tab [vc_tab"; $active = 3; $needle = "[vc_tab"; $replace = '[vc_tab active="true"'; if( substr_count( $string, $needle) < $active) { throw new Exception("There aren't enough needles in the string to do this replacement"); } $count = 0; $index = 0; while( $count++ < $active) { $index = strpos( $string, $needle, $index) + strlen( $needle); } echo "Index: ", $index, " ", substr( $string, index);
Output for git.master, git.master_jit, rfc.property-hooks
Index: 23 Fatal error: Uncaught Error: Undefined constant "index" in /in/uuSiB:17 Stack trace: #0 {main} thrown in /in/uuSiB on line 17
Process exited with code 255.

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