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    <p>I was curious about this, so I ran a test. I used the following code:</p> <pre><code>&lt;?php ini_set('memory_limit', '1024M'); define ('CORE_PATH', '/Users/foo'); define ('DS', DIRECTORY_SEPARATOR); $numtests = 1000000; function test1($numtests) { $CORE_PATH = '/Users/foo'; $DS = DIRECTORY_SEPARATOR; $a = array(); $startmem = memory_get_usage(); $a_start = microtime(true); for ($i = 0; $i &lt; $numtests; $i++) { $a[] = sprintf('%s%sDesktop%sjunk.php', $CORE_PATH, $DS, $DS); } $a_end = microtime(true); $a_mem = memory_get_usage(); $timeused = $a_end - $a_start; $memused = $a_mem - $startmem; echo "TEST 1: sprintf()\n"; echo "TIME: {$timeused}\nMEMORY: $memused\n\n\n"; } function test2($numtests) { $CORE_PATH = '/Users/shigh'; $DS = DIRECTORY_SEPARATOR; $a = array(); $startmem = memory_get_usage(); $a_start = microtime(true); for ($i = 0; $i &lt; $numtests; $i++) { $a[] = $CORE_PATH . $DS . 'Desktop' . $DS . 'junk.php'; } $a_end = microtime(true); $a_mem = memory_get_usage(); $timeused = $a_end - $a_start; $memused = $a_mem - $startmem; echo "TEST 2: Concatenation\n"; echo "TIME: {$timeused}\nMEMORY: $memused\n\n\n"; } function test3($numtests) { $CORE_PATH = '/Users/shigh'; $DS = DIRECTORY_SEPARATOR; $a = array(); $startmem = memory_get_usage(); $a_start = microtime(true); for ($i = 0; $i &lt; $numtests; $i++) { ob_start(); echo $CORE_PATH,$DS,'Desktop',$DS,'junk.php'; $aa = ob_get_contents(); ob_end_clean(); $a[] = $aa; } $a_end = microtime(true); $a_mem = memory_get_usage(); $timeused = $a_end - $a_start; $memused = $a_mem - $startmem; echo "TEST 3: Buffering Method\n"; echo "TIME: {$timeused}\nMEMORY: $memused\n\n\n"; } function test4($numtests) { $CORE_PATH = '/Users/shigh'; $DS = DIRECTORY_SEPARATOR; $a = array(); $startmem = memory_get_usage(); $a_start = microtime(true); for ($i = 0; $i &lt; $numtests; $i++) { $a[] = "{$CORE_PATH}{$DS}Desktop{$DS}junk.php"; } $a_end = microtime(true); $a_mem = memory_get_usage(); $timeused = $a_end - $a_start; $memused = $a_mem - $startmem; echo "TEST 4: Braced in-line variables\n"; echo "TIME: {$timeused}\nMEMORY: $memused\n\n\n"; } function test5($numtests) { $a = array(); $startmem = memory_get_usage(); $a_start = microtime(true); for ($i = 0; $i &lt; $numtests; $i++) { $CORE_PATH = CORE_PATH; $DS = DIRECTORY_SEPARATOR; $a[] = "{$CORE_PATH}{$DS}Desktop{$DS}junk.php"; } $a_end = microtime(true); $a_mem = memory_get_usage(); $timeused = $a_end - $a_start; $memused = $a_mem - $startmem; echo "TEST 5: Braced inline variables with loop-level assignments\n"; echo "TIME: {$timeused}\nMEMORY: $memused\n\n\n"; } test1($numtests); test2($numtests); test3($numtests); test4($numtests); test5($numtests); </code></pre> <p>... And got the following results. Image attached. Clearly, sprintf is the least efficient way to do it, both in terms of time and memory consumption. EDIT: view image in another tab unless you have eagle vision. <img src="https://i.stack.imgur.com/QUQwR.jpg" alt="enter image description here"></p>
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    1. POphp String Concatenation, Performance
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    1. USEvilnode
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    1. This table or related slice is empty.
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      1. VTUpMod
    2. VO
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    1. COshould have 1 more test: similar to `test2` but replace `.` with `,` (without output buffer, of course)
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