PHP Memory Model Overview
PHP uses automatic memory management, meaning the engine allocates and frees memory for variables without requiring manual control from the developer.
PHP's memory model is designed to simplify development while remaining efficient internally. Every time you assign a value to a variable, PHP automatically allocates memory. When the variable is no longer needed, that memory is released and reused. This approach reduces the risk of memory leaks. Understanding how PHP manages memory is important for large or long-running applications where performance and resource usage matter.
memory_usage.php
1234567891011121314151617181920<?php // Assign a string to a variable $name = "Alice"; // PHP allocates memory to store the string "Alice" // You can check current memory usage: echo "Memory usage after variable assignment: " . memory_get_usage() . " bytes\n"; // Assign an array to another variable $numbers = range(1, 1000); // PHP allocates more memory for the array echo "Memory usage after array assignment: " . memory_get_usage() . " bytes\n"; // Unset the array to free its memory unset($numbers); // PHP releases the memory used by $numbers echo "Memory usage after unsetting array: " . memory_get_usage() . " bytes\n"; ?>
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PHP uses automatic memory management, meaning the engine allocates and frees memory for variables without requiring manual control from the developer.
PHP's memory model is designed to simplify development while remaining efficient internally. Every time you assign a value to a variable, PHP automatically allocates memory. When the variable is no longer needed, that memory is released and reused. This approach reduces the risk of memory leaks. Understanding how PHP manages memory is important for large or long-running applications where performance and resource usage matter.
memory_usage.php
1234567891011121314151617181920<?php // Assign a string to a variable $name = "Alice"; // PHP allocates memory to store the string "Alice" // You can check current memory usage: echo "Memory usage after variable assignment: " . memory_get_usage() . " bytes\n"; // Assign an array to another variable $numbers = range(1, 1000); // PHP allocates more memory for the array echo "Memory usage after array assignment: " . memory_get_usage() . " bytes\n"; // Unset the array to free its memory unset($numbers); // PHP releases the memory used by $numbers echo "Memory usage after unsetting array: " . memory_get_usage() . " bytes\n"; ?>
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