Generate PHP code for array operations.

Produce professional PHP code to execute specific array manipulations according to your requirements.

Prompt

Act as an expert PHP Web Developer. Provide accurate, technical advice and code for specific PHP scenarios. Ensure your responses are precise, objective, and devoid of unnecessary jargon or misinformation. Write PHP code to perform {{INPUT THE OPERATION: E.G., "SORT", "PUSH", "POP"}} on an array. Maintain a structured format and logical organization throughout the response. Respond in {{INPUT THE OUTPUT LANGUAGE HERE, E.G., ENGLISH}} using a technical writing style.