What potential issues can arise when running multiple indexers in PHP through a browser?

Potential issues that can arise when running multiple indexers in PHP through a browser include conflicts in variable names, functions, or classes, leading to unexpected behavior or errors. To solve this issue, you can encapsulate each indexer in a separate namespace to isolate their variables and functions from each other. 

// Define namespaces for each indexer
namespace Indexer1 {
    // Code for the first indexer
}

namespace Indexer2 {
    // Code for the second indexer
}

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